Chiworld Stereo Bluetooth Headset / wireless headphone Black BLH-901742-TP-YD-MOTS9HD Compatible with: Any brand of compatible Bluetooth-enabled phone or music device that supports Advanced Audio Distribution Profile (A2DP) and Audio Video RemoteControl Profile (AVRCP),such as mobile phone, PDAs, and laptops, MP3/4/5, and so on; Technology standard: Bluetooth version2.0, HFP1.5., A2DP1.2, AVRCP1.0; About power supply: Built-in Li-ion polymer rechargeable battery, 6h for talking&playing music; 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, and then use your phone to search the Bluetooth devices named A11; Package included: 1 x Bluetooth Headset ,1 x Travel Charger (US plug),2 x Ear Buds, 1 x User Manual.