# AV transmitter & receiver StarTech.com ST121HDBTDK

**URL:** https://aio.lv/en/product--startech-st121hdbtdk--294368
**Data updated:** 2025-12-28 21:14 (EET)
**Category:** Audio & Video Extenders
**Manufacturer:** StarTech
**Manufacturer code:** ST121HDBTDK
**EAN:** 0065030864916
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 438.49 €
**Prices and availability valid until:** 2026-07-06 23:59
**Price without VAT (21%):** 362.39 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--startech-st121hdbtdk--294368

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 08.07.2026 | free |
| Pickup points | 13.07.2026 | 1.99 EUR |
| Courier delivery to door | 13.07.2026 | 4.99 EUR |

## Summary description

The StarTech.com 4K HDMI Extender with Compact Transmitter supports UHD 4K resolution up to 4096 x 2160 pixels. It utilizes HDBaseT technology for reliable wired connectivity over Cat5e or Cat6 cables. With an AC input voltage range of 100-240 V and operating voltage of 12 V, it is designed for versatility. Compact dimensions of 68 mm x 80 mm x 25 mm make it easy to integrate into any setup.

## Long description

The StarTech.com AV transmitter & receiver ST121HDBTDK is a 4K HDMI extender kit that uses HDBaseT technology to transmit HDMI A/V signals over a single CAT cable up to 70 m (230 ft.). The compact transmitter includes a built-in HDMI cable and is USB-powered from the source device, while the receiver includes mounting hardware for a discreet installation. The kit supports UHD 4K video (up to 4096 x 2160) and 7.1 audio and is compatible with CAT5e, CAT6 and CAT7 cabling.
Advantages
The ST121HDBTDK provides a simple, space-saving installation with a small, USB-powered transmitter that connects directly to the source via its integrated HDMI lead. It maintains 4K picture quality at distances up to 40 m (130 ft.) and supports 1080p and lower resolutions up to 70 m (230 ft.), while also carrying 7.1 audio channels. Using a single CAT cable reduces cabling complexity and potential failure points compared with dual-cable extenders.
Suitable for
Digital signage and public displays
Conference rooms and meeting spaces
Home theatre or media room distribution
AV installations where discreet, wall- or rack-mounted receivers are required
Key specifications
Type: AV transmitter & receiver
Maximum resolution: 4096 x 2160 (4K UHD)
Maximum transfer distance: up to 70 m (230 ft.) over CAT5e/CAT6 (4K up to 40 m / 130 ft.)
Audio: 7.1 channels
HDMI in: 1; HDMI out: 1
RJ-45 ports: 1 input, 1 output
Cable types supported: Cat6, Cat5e, Cat7
Colour: Black
Weight: 0.252 kg
Manufacturer part number (MPN): ST121HDBTDK
EAN: 0065030864916
How to use
Connect the transmitter's built-in HDMI cable to your source device and power the transmitter from a USB port on that source. Run a single CAT5e/CAT6/CAT7 cable from the transmitter to the receiver and connect the receiver to the display via HDMI. Use the included mounting hardware to install the receiver where required. Verify video resolution settings on the source to match the display and ensure cable runs do not exceed the supported distances for the desired resolution.
Usage recommendations
For reliable 4K performance, use high-quality Cat6 or Cat7 cable and keep the run at or below 40 m (130 ft.). For 1080p or lower resolutions, Cat5e/Cat6 can be used for runs up to 70 m (230 ft.). Avoid running HDMI-over-CAT cables parallel to high-voltage power lines to reduce interference.

## Specifications

### Technical details

| Feature | Value |
|---|---|
| Sustainability certificates | RoHS |

### Ports & interfaces

| Feature | Value |
|---|---|
| HDMI in | 1 |
| Number of HDMI outputs | 1 |
| RJ-45 input ports | 1 |
| RJ-45 output ports | 1 |
| Connectivity technology | Wired |

### Power

| Feature | Value |
|---|---|
| Power consumption (typical) | 18 W |
| External power adapter | Yes |
| Input current | 0.6 |
| Output current | 1.5 A |
| Operating voltage | 12 V |
| AC input voltage | 100-240 |
| Power plug type | Type M |

### Weight & dimensions

| Feature | Value |
|---|---|
| Weight | 0.252 kg |
| Height | 25 mm |
| Width | 68 mm |
| Depth | 80 mm |

### Operational conditions

| Feature | Value |
|---|---|
| Operating relative humidity (H-H) | 0 - 80 |
| Storage temperature (T-T) | -10 - 60 |
| Operating temperature (T-T) | 0 - 40 |

### Packaging data

| Feature | Value |
|---|---|
| Package weight | 1600 g |
| Package depth | 293 mm |
| Package height | 74 mm |
| Package width | 196 mm |

### Packaging content

| Feature | Value |
|---|---|
| AC adapter included | Yes |
| Cables included | USB |
| Quick start guide | Yes |
| Mounting kit | Yes |
| Included power plug types | UK, NA, EU, ANZ |

### Features

| Feature | Value |
|---|---|
| Type | AV transmitter & receiver |
| Maximum resolution | 4096 x 2160 |
| Cable types supported | Cat6, Cat5e |
| Maximum transfer distance | 70 m |
| Certification | CE, FCC, TAA, REACH |
| Audio system | Multichannel |
| Rack mounting | Yes |
| Plug and Play | Yes |
| Cable length | 0.1 m |
| Product colour | Black |
| Audio output channels | 7.1 |
| Daisy chain | No |
| HDBaseT certified | Yes |
| LED indicators | Status |

## FAQ

### How much does the AV transmitter & receiver StarTech.com ST121HDBTDK cost, and is it available for purchase?

The price is 438.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 12 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 08.07.2026 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: Cash payment, 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 StarTech 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 StarTech 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. More information about warranty service: https://aio.lv/en/warranty

### How can I tell if this product suits my needs?

When making a choice, we recommend paying attention to the key features: hdmi in, number of hdmi outputs, rj-45 input ports, rj-45 output ports, weight, type, maximum resolution, maximum transfer distance, cable types supported, 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 AV transmitter & receiver StarTech.com ST121HDBTDK?

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.

## Image

https://aio.lv/img/cache/product/294368/56389428_large.webp