Color: Black Bluetooth Version: v2.1Chipset: CSR BC6 V2.1 Support: Headset，Headfree，Noise-Canceling，Voice-Dial/MuteEar Coupling: Over the earTalk Time: 20 HourStandby Time: 350 HourOperating Range: 10 meterCompatibility Bluetooth: v2.0 & 2.1Microphone: YesRadio: N/APower Supply: Built-in batteryBuilt-in Battery Capacity: 250mAhCompatible With: All Bluetooth wireless technology enabled phones.Other Features: Clear and high quality voice for both talking party. Voice-dialing， re-dialing， refusal of incoming call function. Volume adjustable.Packing List : 1 x Bluetooth headphone 1 x 2-Flat-Pin plug power adapter 1 x USB charging cable 1 x English user manual