Fangrui Product Details 1. And 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 At . 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 ) Battery Life: About 14h Charging Time: About 2h Signal-to-noise Ratio: 60db Distortion: Less Than 0. Frequency Response Rate: 20hz-15khz Left And Right Separation: 60db Microphone Effective Distance: 0-1m Colour:black Material:plastic Package Contents: 1 X Car Bluetooth Receiver Only The Above Package Content