Stereo wireless bluetooth Headset HM1000 earphone for IPHONE Samsung Galaxy S5 iphone5s HTC mobile phonesWith frequency range 2.4GHz-2.48GHz; Transmission power- Class 2; Operating voltage- 3.6V; Operating current-25mA, Standby Current- 0.5mA, voice dialing with handsfree and convertible earpiece.Light earbuds: Tight and light for more comfortable wearing. Superior sound isolation by eartips, provides comfort for your ear.