W23 Bluetooth 5.3 Hands-Free AUX Wireless Transmitter Car Audio Receiver Adapter 1. Bluetooth 5.3：Featuring the latest Bluetooth 5.3 version for improved connectivity and stable signal transmission. 2. Compact and Portable：With dimensions of 40 x 23 x 13.6mm and weighing only 15g, this adapter is perfect for on-the-go use. 3. Versatile Compatibility：Easily connects to car audio systems via AUX, transforming them into wireless BT-enabled devices. 4. Hands-Free Calling：Enables convenient hands-free calling for safer driving experiences. 5. Long Battery Life：Equipped with a 50mAh battery, providing approximately 4 hours of continuous use. Specifications: 1. Model: W23 2. Bluetooth Version: 5.3 3. Transmission Range: 5m 4. Material: ABS 5. Input: 5V1A 6. Battery Capacity: 50mAh 7. Operating Time: Approximately 4 hours 8. Net Weight: Approximately 15g 9. Dimensions: 40 x 23 x 13.6mm