# Adapter USB-A to HDMI Retoo E400, black, USB-A video output adapter

**URL:** https://aio.lv/en/product--retoo-e400--12364417
**Data updated:** 2026-04-26 18:53 (EEST)
**Category:** Cable Adapters & Converters
**Manufacturer:** Retoo
**Manufacturer code:** E400
**EAN:** 5904094228096
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 10.49 €
**Prices and availability valid until:** 2026-07-13 23:59
**Price without VAT (21%):** 8.67 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--retoo-e400--12364417

## 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

Retoo E400 is a USB-A to HDMI adapter in black that enables video output from a USB-A port to an HDMI display. It serves as a simple solution for connecting compatible laptops or devices with USB-A to monitors, TVs or projectors that accept HDMI input. Use it for screen mirroring, presentations, video playback and extending desktop display where native HDMI output is unavailable.

## Long description

Retoo E400 is a compact USB-A to HDMI video output adapter in black that enables a system with a USB-A port to connect to HDMI displays such as monitors, TVs and projectors. The adapter provides a simple method for screen mirroring, extending a desktop or playing video on an external display when a native HDMI output is not available. It is designed for straightforward plug-and-play use with compatible devices and typical USB-A host ports.
Advantages
The adapter offers a compact, lightweight form factor that is easy to carry and install. It converts USB-A to HDMI video signal allowing use of a wide range of external displays without opening a device or installing additional internal hardware. The black finish is unobtrusive in office, classroom or home environments. Its single-cable connection reduces cable clutter and provides a direct link from a USB-A port to an HDMI input for presentations and media playback.
Suitable for
 Connecting laptops or desktops with USB-A ports to HDMI monitors or TVs for screen mirroring
 Extending desktop workspace to an external monitor for productivity tasks
 Presentations in meeting rooms where only HDMI input is available
 Playing video or streaming content on larger HDMI displays
When it may not be suitable
This adapter depends on the host device’s support for USB video output over USB-A; not all USB-A ports or systems provide the required driver or protocol support. It is not a replacement for a native GPU HDMI output where higher refresh rates, professional color workflows, or low-latency gaming are required. Compatibility with some operating systems or very old devices may require additional drivers or may be limited.
Key specifications
 Connection type: USB-A (input) to HDMI (output)
 Color: black
 Primary function: video output for screen mirroring, extending display and video playback
 Typical use environments: laptops, desktops, projectors, TVs, monitors
 Form factor: compact, external plug-in adapter
How to use
Plug the USB-A connector of the Retoo E400 into an available USB-A port on your computer. Connect an HDMI cable from the adapter’s HDMI output to the HDMI input of the external display. Switch the external display to the correct HDMI input and, if necessary, select the display mode in the operating system (duplicate/mirror or extend desktop). If the host system requires a driver, follow any on-screen prompts or install the manufacturer-provided driver for proper video output.
What to consider before purchase
 Verify that your device’s USB-A port and operating system support USB-to-video output or the specific driver required
 Confirm the external display has an available HDMI input and use a compatible HDMI cable
 Consider the resolution and refresh rate needs; adapters may have limits compared with native HDMI outputs
Usage recommendations
Use the adapter with a direct USB-A port on the host device rather than through an unpowered hub for more reliable video output. For presentations and office use keep video resolution at a supported level of the adapter and display to ensure stable performance. If extended display features are required, check for the latest drivers and OS compatibility before deployment.

## FAQ

### How much does the Retoo E400 USB-A to HDMI adapter cost, and is it available for purchase?

The price is 10.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 2105 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: 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 Retoo 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 Retoo 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

## Image

https://aio.lv/img/cache/product/12364417/68345385_large.webp