Function: HD voice， Connect with 2 phones as same time， Shoe the power in IOS system，Support under the song control， support stereo playback， support pause， play.Voice dialingBluetooth v3.0，Standby time 75-120 hours，transimission distance: 10 meters.Transmission power: 0dbmFrequency range: 2.402G-2.480GEnvironment temperature: -20/+60 degreesWorking voltage: 3.4V-4.2v