Specifications:Technology:bluetooth4.0Audio output:35mw，15mATransmission range:<10mCharging power: Input AC 110-240v;Output DC5VRadio frequency:2.402-2.480GHZCharging time :2hoursMusic play:3hoursTalk time 4 hoursStandby time:120 hoursWearing styles:in-ear mini headhonesBattrry:50mA rechaergeable lithium batteryConnectors: usbSuit for:all bluetooth deviceInstructions:1，Long time press earphone button morethan 5seconds2，You will see red and blue light flashing alternately3，Then connect your blue tooth，and use earphnoePackage Include1*headphone1*charging Cable 1*Instruction This bluetooth headset very small . Ear never feel uncomfortable with long time uesing