... ,headset avaliable 2.ISO9001,LED display 3.property:compatibility 4.feature:page turner Headset Wireless MicrophoneFUNCTION:1.Multichannels:It has more ... .5.LED display charging status,balanced battery,volume.6.Page turner,USB upgrading.7.Lithium battery.8.It can ... continue,standby time:70days. Transmitter(Holding) Frequency Scope: 2.4~2.483GHz Frequency Response Scope: 50Hz~15KHz Modulation Type: GFSK ...