Bluetooth version: 3.0+EDR Operating distance: 10m Range of frequency: 2.4 to 2.4835GHz ISM band Type: Stereo headphone with Mic Speaker: 10mm Sensitivity: 115dB S.P.L at 1 KHZ Impedance: 32Ω Frenquency response: 20Hz-20KHz Rated power: 2x20mW Rechargeable lithium battery: 100mAh Talk time: Up to 5 hours Music playtime: Up to 4 hours Standby time : 120 hours Compatible for iPhone/HTC/Samsung and other Bluetooth devices Color: Black STN-810 Stereo Wireless Bluetooth Headphone Support pairing Bluetooth devices to play music. Hands-free call function, built-in high sensitive microphones. If not connected Bluetooth mode, it will turn off automatically after 8 minutes. Built-in rechargeable lithium battery, environment protection, economical and practical. 3.5mm audio output port can insert into the bluetooth devices or any 3.5mm jack for listening music. Brand No Brand SKU OT776EL0UXVJCNAFAMZ-140368