... meters 4.Stand-by time:up to 200hours Bluetooth handset TK21) Work with Iphone,I pad,smart phone,tablet PC,PC, ... note book,MID,VOIP,Massager,Skype.2) 3 buttons for easy operate ... 200hours10) Frequency range:2402 MHz-2080Mhz11) Compact and practical,easy for hand carry Fashion!! + color!! + originality!! Bluetooth mini stero handset for iphones(NT-EI006)