Feature: 1. Uses a newly upgraded Bluetooth 5.0 chip for more stable data transmission, wider wireless coverage, and low-power operation for improved power efficiency. 2. Enables wireless music listening and allows connection between your mobile phone and car stereo for wireless audio playback. Supports call noise reduction technology with a built-in power isolation module to separate noise current, ensuring clear call quality. 3. Converts wired earphones and non-Bluetooth speakers into wireless Bluetooth devices. Supports TF card playback, allowing music enjoyment without a Bluetooth connection to a mobile phone. 4. Designed with a back clip for secure attachment and easy portability. Automatically reconnects to previously paired devices upon power-on after initial pairing. 5. Built-in 200mAh lithium-ion battery provides up to 20 hours of music playback time. Charges fully in approximately 2 hours. Specification: Function: Wireless signal transmission, TF card playback Bluetooth protocol: AVRCP, A2DP, HFP Output port: 3.5mm audio jack Signal to noise ratio: 90dB Charging time: 2 hours Battery type: Rechargeable lithium-ion battery Material: Plastic Color: Black Package Contents: 1 x Bluetooth Audio Receiver Note: Light reflection and differences in display screens may cause slight variations in color compared to the actual product. Measurement error is permitted within +/- 1-3cm.