MagicShield HV-800 Wireless Bluetooth Music Stereo Universal Headset Headphone Vibration Neckband Style for iPhone Samsung Cell Phone iPad (Dark Blue) Brand new and high quality Support Bluetooth V3.0, Bluetooth A2DP and call Charging Voltage: Micro USB 5V Charging Time: 2h-3h; Bluetooth Working Range: 10m Output Power: 2*20mW; Frequency Range: 2.401-2.480GHz Distortion Factor: 1%; Frequency Response: 20Hz-20KHz