Specifications: Technology: bluetooth 4.0 Transmission range: <10 m Radio frequency: 2.402-2.480GHz Audio output: 35mW， <15mA Connectors:USB Charging Power: Input AC 110-240V; Output DC 5V Music play: 3 hours Talk time: 4 hours Standby time: 120 hours Charging time: 2 hours Wearing styles: In-Ear mini headphones Battery: 50mA rechargeable lithium battery Suit for: all bluetooth deviceInstructions: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 * Headphone 1 * Charging Cable