Bluetooth version: 5.1

Support range: 2.402-2.480GHz

Impedance: 32 Ω

Frequency response: 20-20KHZ

Sensitivity: 118+/-3dB@1KHz

Transmission distance: 10 meters 

Use time: 4-5 hours

Standby time: 120 hours

Rechargeable lithium battery: 3.7V/200mAh

Functions: adjust volume, switch songs, incoming call, reject incoming call, hang up the phone, Bluetooth playback, hands-free call, phone replay, Bluetooth back connection, voice prompt, power display, FM, TF card, pure English broadcast, 5 minutes not connected automatic shutdown, 1 to 2