More Details: Specifications: Basic Specification Brand Name HOCO Model Number EPB03 Bluetooth Version V4.1 Bluetooth Protocol HFPV1.6, HSPV1.2, A2DPV1.2, AVRCPV1.0, Dlv1.3 Battery Capacity 110mAh Receive Power -80 DBM Transmission Distance 10m Working Time 8 hours Standby Time 4 weeks Charging Time 2.5 hours Cable Length About 680mm Cable Type Cable Type: Avoiding winding dual color noodle cable Driver 14mm aluminum coil Sensitivity -80dB<0.1% BER Impedance 32Ω Frequency Response 20-20kHz Microphone Yes Prompt Voice Language English Multi-point Connect to two devices at the same time Package Included 1 X HOCO EPB03 Bluetooth Headphone 3 X Pairs Earmuffs 1 X Ear Bag 1 X English\/Chinese Manual Operation Guide: 1. With earphone turned off, press power\/pairing button until the LED flashed red\/blue. Activate Bluetooth pairing mode. 2. Select "HOCO EPB03" from the list of the Bluetooth devices shown on your devices. If device asks for a passward, enter four zeros(0000). 3. The headphone's LED will stop flashing red\/blue once successfully paired\/connected.