Equipped with high-performance Bluetooth 5.2 chip, signal enhancement, rapid response, supports /AAC//LL/HD/AD decoding protocol. Plug and play, dual mode of receiving/transmitting, with the ability to switch between receiving (RX) and transmitting (TX) signals, making it easy to adapt to most devices. Hands free communication, driving , built-in wireless microphone, one click answer/reject for incoming calls Enjoy mobile music and high-definition voice navigation broadcasts as you please for a experience, freeing your hands and instantly upgrading to new features. Upgrading the Bluetooth of the old speaker brings new life to the old device. By connecting to the RX audio port, it can automatically switch to the receiving mode. The old speaker/amplifier can instantly switch to Bluetooth function, allowing for immersive music enjoyment. After connecting two phones at the same time, it can switch back and forth to play audio from either phone A or phone B. Upgrade old TV and connect two Bluetooth devices at the same time, solving the problem of old TV without Bluetooth and unable to connect Bluetooth playback devices. Watch /sports games/news without worrying about affecting family rest. Product Name: Bluetooth Audio Receiver and Transmitter Audio output: AUX (receive mode RX) Audio input: AUX/Type-C (TX transmission mode) Bluetooth version: Bluetooth 5.2 Transmission distance: about 10 meters (in accessible conditions) Audio decoding: ,AAC,,LL,HD,AD Basic functions: Bluetooth receiver (RX), Bluetooth transmitter (TX), hands-free calling Frequency range: 2.402GHz-2.480GHz Distortion: 0.02% Input parameter: 5V=200mA Battery capacity: 3.7V 300mAh (polymer lithium battery) Colour:As Shown Material:ABS Package Contents: 1 * AudioAdapter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.