1. and unique appearance design, excellent product quality. 2. Ultra-long battery life playback time. 3. Last number call back function. 4. Volume memory function. 5. Multi-function use for sports, car, home audio and video. 6. Clear transmission, pleasant sound quality, stable signal. 7. Can switch Bluetooth/FT card to play music at will. 8. Built-in microphone, one-click answer/reject/hang up/redial call. 9. Support one-to-two, you can connect two mobile phones at the same time. Dimensions: 6x2.65x2cm Technical parameters: Input voltage: DC5V Battery capacity: 250mAH Bluetooth version: V5.3 Working distance: 10 meters Audio interface: 3.5MM audio jack Charging interface: TYPE-C TF card slot: 1 (insert TF card to play music) Battery life: about 14H Charging time: about 2H Signal-to-noise ratio: Greater than 60DB Distortion: Less than 0.1% Frequency response rate: 20HZ-15KHZ Left and right separation: Greater than 60DB Microphone effective distance: 0-1M Colour:Black Material:plastic Package Contents: 1 x Car Bluetooth Receiver 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.