Specifications: Suit for: all bluetooth device Technology: bluetooth 4.0 Radio frequency: 2.402-2.480GHz Audio output: 35mW、 <15mA 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 seconds2 You will see red and blue light flashing alternately3 Then connect your bluetooth、 and use earphone Package Include: 1 x Headphone 1 x Charging Cable