Specifications: Technology: bluetooth 4.0... Audio output: 35mW, <15mA Radio frequency: 2.402-2.480GHz.. Transmission range: <10 m Charging Power: Input AC 110-240V; Output DC 5V.. Charging time: 2 hours Talk time: 4 hours Music play: 3 hours Standby time: 120 hours Wearing styles: In-Ear mini headphones Battery: 50mA rechargeable lithium battery Instructions: 1 Long time press earphone button more than 5 seconds 2 You will see red and blue light flashing alternately 3 Then connect your bluetooth, and use earphone Package Include: 1 x Headphone , 1 x Charging Cable