Audiotek AT-BTR4 Universal Bluetooth Audio Adapter

The Audiotek AT-BTR4 is a universal Bluetooth audio adapter designed to add wireless music streaming to a vehicle or marine audio system with a compatible 3.5 mm auxiliary input. It provides a practical solution for radios that do not have built-in Bluetooth connectivity. Pair a compatible phone, tablet, or portable player and stream audio through the existing system.

This adapter is suited to cars, boats, RVs, caravans, and similar installations where an existing radio has both USB power access and a 3.5 mm audio connection. It works with Bluetooth-enabled iPhone, Android, and Windows smartphones, as well as iPad and iPod devices. Playback selection and volume remain controlled from the paired mobile device.

The AT-BTR4 uses Bluetooth 4.0 technology and supports the A2DP audio profile for wireless stereo music streaming. Its listed CRS i9 Bluetooth chip is intended to support stable everyday audio playback. The unit is intended as an audio receiver rather than a replacement head unit, amplifier, or speaker controller.

For added convenience, the adapter is listed with automatic startup and reconnection behavior for the last connected device. Multiple devices may be paired with the receiver, although only one device can stream music at a time. If the active device remains disconnected for more than one minute, the adapter enters pairing mode.

Its compact, hideaway-oriented design allows the receiver to be installed out of sight while leaving the vehicle interior free of a visible streaming device and excess cabling. The AT-BTR4 is listed as waterproof and suitable for marine use, making it appropriate for compatible boat and yacht audio systems. A remote-output function is also listed for system integration when Bluetooth audio is active and music is playing.

Key Features

• Bluetooth 4.0 Streaming: Adds wireless music playback from compatible Bluetooth devices.
• A2DP Audio Profile: Supports stereo Bluetooth audio streaming to an existing auxiliary input.
• 3.5 mm Audio Connection: Connects to compatible car or marine radio auxiliary inputs.
• USB Power Connection: Uses a USB connection for power in compatible installations.
• Automatic Reconnection: Remembers and reconnects with the last connected device.
• Waterproof Marine Use: Listed for concealed vehicle, boat, yacht, and caravan installations.

Design & Installation

The AT-BTR4 is a compact black Bluetooth receiver intended for hidden installation rather than dashboard display use. Its listed waterproof and marine-oriented construction supports use in compatible vehicle and marine environments. Because music control is handled by the paired device, the receiver can remain installed out of sight.

Connect the adapter to USB power and connect its 3.5 mm audio lead to a compatible radio or audio system input. Pair a Bluetooth-enabled mobile device, then use that device to select music and adjust playback settings. For a clean installation, route the adapter behind a dash panel or within a protected audio-equipment area while maintaining access to the required USB and auxiliary connections.