... 2.working scope:10 meter 3,Long standby/Telephone conversation time 4,Bluetooth earphonoe 5,CE&ROHS Wirless ... 2 Support arrangement:Theblue tooth earphonoe,exempts raises Transmission:Wireless transmission Scope:10 meter enterfrequencies;2441.00Hz Frequency range ... chargethe lithiumbatterry(3.7V,550mAh,602025) Standby time:5day Telephone conversation time:24 hour Durations of charing:4hour Use ...