Two Wireless Audio Problems. One Small Adapter.

Whether your car has an AUX port but no Bluetooth or your TV won't connect to your wireless headphones, the Astrum BT230 solves both. This compact 2-in-1 Bluetooth 5.3 adapter works as both a transmitter and a receiver, adding wireless audio to virtually any device with a 3.5mm AUX connection.

Transmit Mode - Make Wired Devices Wireless

Connect the BT230 to the headphone jack of a TV, laptop, treadmill, or in-flight entertainment system, and it wirelessly transmits audio to your Bluetooth headphones or speaker. Enjoy private listening at home or use your own wireless earbuds during flights instead of airline headphones.

Receive Mode - Add Bluetooth to Anything with AUX

Plug the BT230 into your car stereo, home hi-fi, bookshelf speakers, or wired headphones to stream music wirelessly from your smartphone. It's an ideal solution for vehicles with an AUX input but no built-in Bluetooth. The integrated microphone also enables hands-free calling through your car's audio system without needing to touch your phone.

45-Minute Charge. Up to 6-Month Standby.

A full charge via USB-C takes approximately 45 minutes. The BT230 provides up to 5.4 hours of playback in Receive (RX) mode and up to 2 hours in Transmit (TX) mode. You can charge while using it to extend longer TX sessions - a small number of users report occasional interference or brief disconnects while doing so. With standby time of up to six months, it's ready whenever you need it. The built-in LED display clearly shows the operating mode, pairing status, and remaining battery level.

Two Independent Volume Controls

The BT230 has its own volume control, separate from the connected device's. Because AUX is a simple analog connection, it can't send remote volume commands to your TV or car stereo - for the clearest sound, set the connected device's volume high and fine-tune the level using the BT230's own control.

Built to Carry

Bluetooth 5.3 provides fast pairing, a stable wireless connection, and a range of up to 10 metres. The lightweight zinc alloy housing weighs only 15g, making it easy to carry in a pocket, laptop bag, or vehicle storage compartment.

Tip:

If your receiving device doesn't pick up the signal immediately, briefly toggle between TX and RX mode to refresh the connection.

Technical Specifications

• Model: BT230
• Bluetooth Version: 5.3
• Operating Modes: TX (Transmit) / RX (Receive)
• Connection: 3.5mm AUX
• Wireless Range: Up to 10m
• Battery Capacity: 120mAh Rechargeable
• Working Time: Up to 5.4 Hours (RX) / Up to 2 Hours (TX)
• Standby Time: Up to 6 Months
• Charging Interface: USB-C
• Charging Time: Approximately 45 Minutes
• Microphone: Built-In
• Display: LED
• Body Material: Zinc Alloy
• Weight: 15g
• Warranty: 12 Months

What's in the box
1 x Astrum BT230 Bluetooth Transmitter & Receiver
1 x USB-C Charging Cable
1 x User Guide