Digital family BH-503 Wireless Bluetooth Stereo Headset Headphone Premium Sound Super Bass BLH-901742-TP-YD-BH503 Compatible with: Various Bluetooth 2.0 enabled devices such as mobile phones, PDAs, and laptops, MP3/4/5, and so on. Technology standard: Bluetooth version:2.0,transmist power: class 2, working range: 10M; About power supply: Built-in 160 mAh Li-ion polymer rechargeable battery, operating time up to 8h for talk, standby time (maximum) up to 160 h With Bluetooth; How to connect it with your phone? you must long press the answer (looks like a phone) button for at least 8 seconds until you see the blue light flashing, and then use your phone to search the Bluetooth devices named BH-503; Package included: 1 x Bluetooth Headset, 1 x User Manual, 1 x Charger (US plug only).