Description 1.Beautiful look and light-weight design. 2.Double-ear earpiece design,can be used separetly 3.Bluetooth 4.2 chipsetwith stereo, better sound quality. 4.True Wireless and more convenient for sports . 5.Long time charger case and fast charger for earbuds. 6.Two colors for your option:black and white. SPIFICICATION Compatible with all audio equipments with bluetooth functions,such as PC,Ipad,Ipod,cellphone,tablets,MP3� CSR solution,HSP,HFP,A2DP,AVRCP Button functions:V- /next music/V+/previous music /pause/play Bluetooth protocol standards:Bluetooth V4.1+EDR Receiver distance:10m / 360° Battery:3.7V/110mAh lithium-ion battery Charging time:Less than 2.5 hours Successive working time:About 3 hours Standby time:40 hours Speaker diameter:Φ10mm Impedance:16Ω S.P.L:106dB S.P.L.at 1KHz MIC type :Capacitive Microphone Unit:Φ4*1.5mm Frequency Response:20Hz-20,000Hz Operating voltage:4.5V