product description: Suit: for all bluetooth deviceTechnology: bluetooth 4.0Radio frequency: 2.402-2.480GHzAudio output: 35mW、 <15mATransmission range: <10 mCharging Power: Input AC 110-240V; Output DC 5VCharging time: 2 hoursTalk time: 4 hoursMusic play: 3 hoursStandby time: 120 hoursWearing styles: In-Ear mini headphonesBattery: 50mA rechargeable lithium batterySize: 3* 1.8* 1.5cmInstructions:1 Long time press earphone button more than 5 seconds2 You will see red and blue light flashing alternately3 Then connect your bluetooth、 and use earphonePackage Contents:1 x headphone (with box package)1 x charging cable