Vsport&reg; Lightweight Wireless Bluetooth Headphone Headset with In-car Charging Dock for iPhone iPad Ipod Samsung Galaxy and Other Bluetooth Devices (Black) BLUETOOTH V4.0 CLASS II VERSION - Provide more stable bluetooth signal and lower Power Consumption, can also pair with two Bluetooth-enabled devices at the same time Long Battery Life - 3 hours phone calling and 100 hours of standby. Just need 1.5-2 hours to charge it fully NOISE REDUCTION - DSP intelligent noise reduction technology to provide clear, crisp audio BATTERY CAPACITY DISPLAY - You can just check the battery capacity of the headset on the iphone MULTIFUNCTION - It's compatible with most bluetooth devices. You can also answer the call and listen to music with this headset