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header-product PC Case Cooler Master MasterBox MB400L Tower Black
33.99 €

PC Case Cooler Master MasterBox MB400L Tower Black

PC Case Cooler Master MasterBox MB400L Photo 1
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PC Case Cooler Master MasterBox MB400L Photo 8
PC Case Cooler Master MasterBox MB400L Photo 9
PC Case Cooler Master MasterBox MB400L Photo 10
PC Case Cooler Master MasterBox MB400L Photo 1
PC Case Cooler Master MasterBox MB400L Photo 2
PC Case Cooler Master MasterBox MB400L Photo 3
PC Case Cooler Master MasterBox MB400L Photo 4
PC Case Cooler Master MasterBox MB400L Photo 5
PC Case Cooler Master MasterBox MB400L Photo 6
PC Case Cooler Master MasterBox MB400L Photo 7
PC Case Cooler Master MasterBox MB400L Photo 8
PC Case Cooler Master MasterBox MB400L Photo 9
PC Case Cooler Master MasterBox MB400L Photo 10
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PC Case Cooler Master MasterBox MB400L Tower Black

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Short description

The Cooler Master MasterBox MB400L is a sleek black tower PC case designed for optimal airflow and cooling. It supports ATX power supplies and accommodates front fans of 120mm and 140mm. The case comes with a pre-installed 120mm rear fan and supports HDD sizes of 2.5" and 3.5". With dimensions of 210mm width, 411mm depth, and 410mm height, it offers a compact yet spacious design for your components.
Available at price 33.99 €: 100 pcs.
Total available for order: 400 pcs.
Warranty: 2 Years
SKU: 3491871
free shipment

Cheapest delivery:

Unisend LV

Pick-up points

Unisend LV

Cost

1.79 €

Deliver

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Customer service center
2b. Kengaraga str., Riga, Latvia, LV-1063
18.09.2026 {{selectedOffer.officeDeliveryString}}
free
Courier Delivery Please note that in case of a large parcel additional delivery costs may apply!
23.09.2026 {{selectedOffer.courierDeliveryString}}
From 5.54 € (Weight: 5.79 kg)
Parcel couriers
Unisend LV / Latvijas Pasts nodaļa
23.09.2026 {{selectedOffer.parcelStationDeliveryString}}
From 1.79 €
payment
Payment Methods:
Bank transfer, Bank cards on-line, Apple Pay, Google Pay
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Product information

Description

The Cooler Master MasterBox MB400L Tower Black is a Micro-ATX tower PC case with a brushed front panel and a subtle Cooler Master hexagon motif. Designed for effective airflow, the case includes a pre-installed 120mm rear fan, mesh intakes on the front panel, and support for multiple fan and radiator configurations while accommodating Mini-ITX and Micro-ATX motherboards, 2.5" and 3.5" drives, and ATX power supplies.

Advantages

The brushed front panel provides a minimalistic, durable finish while the hexagon emblem can illuminate when an optional RGB/ARGB fan is mounted behind the front panel. Mesh side intakes across the front increase airflow. The chassis supports up to six fans simultaneously, multiple radiator placement options (front, top, rear), and a removable/adaptable drive cage for flexible storage and PSU configurations. Two 3.5" and two 2.5" drive bays plus a 5.25" bay offer storage versatility.

Suitable for

  • Compact gaming builds using Micro-ATX or Mini-ITX motherboards
  • Systems requiring enhanced airflow and multiple fan/radiator configurations
  • Users who want a clean, minimal exterior with optional front-panel lighting

Key specifications

  • Form factor: Micro-ATX tower (supports Mini-ITX, Micro-ATX)
  • Front panel finish: Brushed
  • Pre-installed fans: 1 × 120mm rear fan
  • Maximum fan support: Up to 6 fans
  • Drive bays: 2 × 3.5", 2 × 2.5", 1 × 5.25"
  • Maximum GPU length: up to 344 mm
  • Maximum CPU cooler height: up to 166 mm
  • Maximum PSU length: up to 325 mm
  • Front/top/rear radiator support
  • Front I/O: 1 × USB 3.2 Gen 1 Type-A, 1 × USB 2.0
  • Material: Steel, Plastic
  • Colour: Black
  • Weight: 5.2 kg

How to use

Install a Mini-ITX or Micro-ATX motherboard on the included standoffs, mount storage drives in the removable drive cage or dedicated trays, and position the power supply at the rear. Use the available fan mounts to add up to six fans and place radiators in the front, top, or rear positions as needed for your cooling setup. If preferred, remove the drive cage to free space for larger radiators or longer PSUs. Connect front I/O cables to the motherboard headers for USB and power/reset functions.

Usage recommendations

For balanced airflow, use a combination of intake fans at the front and an exhaust fan at the rear; if installing an illuminated front fan, ensure correct ARGB/RGB header compatibility with your motherboard to enable the hexagon glow.

Specifications

USB 3.2 Gen 2 (3.1 Gen 2) Type-A ports quantity:
0
USB 3.2 Gen 2 (3.1 Gen 2) Type-C ports quantity: Number of USB 3.1 (3.1 Gen 2) ports with Type-C connector. USB 3.1 (3.1 Gen 2) is USB interface version which supports transfer rate up to 10 Gbit/s (SuperSpeed+). USB Type-C connector has symmetrical design architecture and compatible with Thunderbolt 3 interface.
0
USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity:
1
USB 2.0 ports quantity: Number of USB 2.0 ports (connecting interfaces) in the device. USB 2.0 was released in April 2000 (now called "Hi-Speed"), adding higher maximum signaling rate of 480 Mbit/s (effective throughput up to 35 MB/s or 280 Mbit/s), USB 2.0 ports are usually black.
1
Power supply included: There is a power supply with this product.
No
Number of 5.25" bays: A drive bay is a standard-area for adding hardware to a computer. Most drive bays are fixed to the inside of a case, but some can be removed. A 5.25" drive bay, also known as full-height bays, were found in old PCs in the early to mid-1980s. They were 3¼″ high by 5¾″ wide, and up to 8″ deep (83 × 146 × 200 mm), used mainly for hard disks and floppy disk drives.
1
Number of 3.5" bays: A drive bay is a standard-area for adding hardware to a computer. Most drive bays are fixed to the inside of a case, but some can be removed. A 3.5" drive bay is for floppy disks.
2
Type: Characteristics of the device.
PC
Form factor: The shape or design of the product.
Tower
Supported HDD sizes: The size of the hard disk drives which can be used by the device.
2.5, 3.5
Supported motherboard form factors: Design of the supported motherboards.
Mini-ITX, Micro ATX
Product colour: The colour e.g. red, blue, green, black, white.
Black
All features

Other features

Volume: The amount of a substance contained.
33.26 L

Logistics data

Harmonized System (HS) code:
84733080

Packaging data

Package weight: Weight of the packaged product.
6200 g
Package height: The distance from the top to the bottom of the packaging.
480 mm
Package depth: The distance from the front to the back of the packaging.
480 mm
Package width: The distance from one side of the packaging to the other.
278 mm

Weight & dimensions

Weight: Weight of the product without packaging (net weight). If possible, the net weight is given including standard accessories and supplies. Please note that sometimes the manufacturer leaves out the weight of accessories and/or supplies.
5.2 kg
Height: The measurement of the product from head to foot or from base to top.
410 mm
Depth: The distance from the front to the back of something.
411 mm
Width: The measurement or extent of something from side to side.
210 mm

Storage

Supported HDD sizes: The size of the hard disk drives which can be used by the device.
2.5, 3.5

Cooling

Top radiator sizes supported:
120
Rear radiator sizes supported:
120
Front radiator sizes supported:
240, 140, 120, 280
Top fans diameters supported:
140, 120
Number of top fans supported (max):
1
Rear fans diameters supported:
120
Number of rear fans supported (max):
1
Rear fans installed:
1x 120 mm
Front fans diameters supported:
120, 140
Number of front fans supported (max):
2

Ports & interfaces

Audio output: The type of audio output that the device produces, and the connector(s).
Yes
Audio input: The type of audio input that the device requires, and the connection needed.
Yes
USB 3.2 Gen 2 (3.1 Gen 2) Type-A ports quantity:
0
USB 3.2 Gen 2 (3.1 Gen 2) Type-C ports quantity: Number of USB 3.1 (3.1 Gen 2) ports with Type-C connector. USB 3.1 (3.1 Gen 2) is USB interface version which supports transfer rate up to 10 Gbit/s (SuperSpeed+). USB Type-C connector has symmetrical design architecture and compatible with Thunderbolt 3 interface.
0
USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity:
1
USB 2.0 ports quantity: Number of USB 2.0 ports (connecting interfaces) in the device. USB 2.0 was released in April 2000 (now called "Hi-Speed"), adding higher maximum signaling rate of 480 Mbit/s (effective throughput up to 35 MB/s or 280 Mbit/s), USB 2.0 ports are usually black.
1

Power supply

Supported power supply form factors:
ATX
Power supply location: Where the power supply is positioned.
Bottom
Power supply included: There is a power supply with this product.
No

Design

Maximum PSU length:
325 mm
Maximum graphics card length:
344 mm
Maximum CPU cooler height:
167 mm
Anti-dust filter:
Yes
Side window: A side window is a transparent side (or part of side) in a housing which enables you to see the internal space of the device.
No
Number of expansion slots:
4
Number of 2.5" bays:
2
Number of 5.25" bays: A drive bay is a standard-area for adding hardware to a computer. Most drive bays are fixed to the inside of a case, but some can be removed. A 5.25" drive bay, also known as full-height bays, were found in old PCs in the early to mid-1980s. They were 3¼″ high by 5¾″ wide, and up to 8″ deep (83 × 146 × 200 mm), used mainly for hard disks and floppy disk drives.
1
Number of 3.5" bays: A drive bay is a standard-area for adding hardware to a computer. Most drive bays are fixed to the inside of a case, but some can be removed. A 3.5" drive bay is for floppy disks.
2
Supported motherboard form factors: Design of the supported motherboards.
Mini-ITX, Micro ATX
Product colour: The colour e.g. red, blue, green, black, white.
Black
Material: The material from which a thing is or can be made e.g. wood, plastic.
Steel, Plastic
Type: Characteristics of the device.
PC
Form factor: The shape or design of the product.
Tower

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Stock data
Warehouse Stock Delivery to the store Store Price
WH115 100 18.09.2026 Best delivery
33.99 € Best price
WH353 100 18.09.2026 Best delivery
45.49 €
WH94 100 18.09.2026 Best delivery
54.99 €
Available only for legal entities
Warehouse Stock Delivery to the store Store Price
WH109 100 02.10.2026
86.49 €
33.99 €
Stock: 100
Delivery Date: 18.09.2026 Best delivery
Warehouse: WH115
45.49 €
Stock: 100
Delivery Date: 18.09.2026 Best delivery
Warehouse: WH353
54.99 €
Stock: 100
Delivery Date: 18.09.2026 Best delivery
Warehouse: WH94
Available only for legal entities
86.49 €
Stock: 100
Delivery Date: 02.10.2026
Warehouse: WH109

Customer reviews

Customer questions

FAQ

How much does the PC Case Cooler Master MasterBox MB400L cost, and is it available for purchase?

The price is 33.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 400 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 18.09.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

What is the warranty period?

All Cooler Master products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized Cooler Master service centers and through AiO.lv

Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. We will assist with consultation, warranty claim processing, and coordination with certified service centers.

How can I tell if this product suits my needs?

When making a choice, we recommend paying attention to the key features: usb 3.2 gen 2 (3.1 gen 2) type-a ports quantity, usb 3.2 gen 2 (3.1 gen 2) type-c ports quantity, usb 3.2 gen 1 (3.1 gen 1) type-a ports quantity, usb 2.0 ports quantity, power supply included, number of 5.25" bays, number of 3.5" bays, type, form factor, supported hdd sizes, supported motherboard form factors, product colour, compatibility with your devices or usage conditions, material quality, functionality, and warranty terms. These characteristics will help you determine how well the model meets your needs.

Where can I download the instructions for PC Case Cooler Master MasterBox MB400L?

You can download the instructions in PDF format from the “Instructions” section on the product description page. The file contains complete information about installation, setup, and usage.
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