Type    Stereo Bluetooth Headphone with Mic

Bluetooth Version    CSR 4.01 + EDR

Support Profiles    HSP, HFP, A2DP, AVRCP.

Operation Distance    10m

Transmitting Power    Class 2

Support TF Card    Up to 16G

Speaker Frequency Range    20~20KHz

Speaker Diameter (Driver Unit)    40mm

Impedance    32ohm

Microphone Dimension    4.5 * 2.2 cm

MIC Sensitivity    -54dB—2dB

MIC Impedance    2.2K

Battery    Rechargeable 3.7V / 160 mAh lithium battery

Talking Time    Up to 11 hours

Music Playing Time    Up to 10 hours

Standby Time    Up to 250 hours

Charge Time    About 2 hours

Charge Port    Micro USB

Plug Type    3.5mm

Audio cable length    1.0m / 3.0ft

Earmuff Diameter    7.5cm / 3.1in

Main item size (Foldable)    18.5 * 16.0 * 7.5cm / 7.28 * 6.29 * 2.95in