The appearance of the product is exquisite.Using Bluetooth 5.0 chip design, the compatibility and stability are stronger. Bluetooth receiving (RX), Bluetooth transmitting (TX) two in one. Equipped with a high-definition LED digital display, the working status and Bluetooth mode are clearly visible. Built-in digital to analog chip, supports AUX, RCA, USB, TF interface. Cool breathing light, red/blue dual-color, soft and not dazzling.Built-in 400mAh rechargeable lithium battery, long battery life. Support USB (U disk), TF card playback and launch.Support 5~8 meters infrared remote control (remote control version only) Built-in high-definition microphone, support wireless music , hands-free calling, navigation. The product connection is simple, without any cumbersome drive and APP download; Product model: Bluetooth version: Bluetooth V5.0 Support protocol: RX: A2DP AVRC TX: A2DP Working frequency band: 2.402GHz -2.480GHz Power level: Power level 2 (Class II) Sensitivity: -85dBm Less than 0.1%BER Signal-to-noise ratio: 90dB Distortion: less than 0.1% Interface Type: Input: 3.5mm AUX+RCA+USB+TF Output: 3.5mm AUX+RCA Supported formats: MP3/WAV/WMA/APE/FLAC/G729/M4A/ALAC//DTS/MIDI/G726/MTY Screen size: 33x14x4MM Working current: Less than 40mA Built-in battery: 3.7V/400mAh Charging current: about 500mA Charging time: about 1 hour Battery life: RX about 6-8H, TX about 8H Bluetooth distance: less than 10M (open place) Charging : -USB 5V/0.5A Compatible devices: Android, IOS system mobile phones and PADs, active speakers, power amplifiers, and Bluetooth speakers or headphones that support A2DP/protocol. Colour:black Material:plastic Package Contents: 1 x Bluetoo Transmitter Receiver 1 x Remote Control 1 x Audio Cable 1 x RCA Cable 1 x Type C Cable 1 x English manual 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.