Bluetooth Audio Receiver Supports FM 1. Supporting equipment: computers, wired headsets, cars, audio equipment, etc. 2. Bluetooth version: Bluetooth bluetooth 4.2 3. Frequency response: 20hz-20khz 4. Continuous use time: 4h 5. Standby time: 15 days 6. Transmission distance (m): 10m 7. Input power: 93mw 8. Charging time: 0.5-1h 9. Battery capacity: 75 mAh 10. Battery voltage: 32-4.2v 11. Standby current (Bluetooth connected): 15mAA 12. Play music current (maximum volume): 25.1mA (TF card 26.3mA) 13. Working rated voltage: 4.10V 14. Transmission radius: 10M 15. Product interface: ACX audio female interface 3.5mm 16. Battery cycle life: 300 cycles greater than 80% of initial capacity 17. Product size: ellipse 11x14 mm length 59 mm (without back clip) Features: 1. Support TF card card function, faster and more stable, no echo and noise 2. Support one belt two, play is not boring, support to connect two devices at the same time, abandon single, more fun 3. Safe and reliable, strong battery life, battery installed protection circuit, providing overcharge, overload, short circuit protection 4. Effectively extend battery life 5. If you want to change it, the headphone cable can be changed freely, so that you can solve the trouble that the earphone and the device cant be separated.