Bluetooth version: V5.1
Driver unit: Φ40mm
Impedance: 32Ω±(15%)Ω                         
Speaker Sensitivity : <85db.
Receiver distance: Up to 10 meters
Frequency response: 20Hz-20kHz
Battery voltage: 3.7v 400mAh
Charging time: about 2 hours                 
Music time : 
Bluetooth mode : about 20hours 
TF card  mode : about 10hours                                                
Standby time : 300hours