Bluetooth type:  CSR8635 V4.1                                                                                               

active noise cancellation ANC bluetooth overear headphone

Speaker Unit:  ¦µ40mm

Magnet: Neodymium

Sensitivity: 90+/-3DB

Impedance:32 ohms+/-10%

Frequency range:20~20KHz

Active cancellation: 20~25dB 

Power: 3.7V  500mah

Bluetooth version: V4.2

operation distance:10m

Continuous working time:15 hours