· Bluetooth type: CSR8635 active noise cancellation · · · · ANC Bluetooth headphone · Speaker Unit: 40mm · Frequency range:20~20KHz · Active cancellation: 20~25dB · Power: 3.7V 360mah · Blue-tooth version: V4.0 · Playback Time (Bluetooth only)::16hs(Bluetooth ), 14hours(ANC) · Charge Time (Bluetooth only):2hs · Operation distance:10m, Range (Bluetooth only): 10m