1,bluetooth transmitter 2,handheld type or usb headset 3,page turner:page up/down 4,laser pointer, ... and so on.6. Remote electronic laser pointer,page turner, USB upgrading.7. Pen designed,instead ... days.For handsfree convenience, the 1090 with pendant type microphone If both hands free is what you ... 2.483GHz Frequency Response Scope: 50Hz~15KHz Modulation Type: GFSK,BT=0.5Gaussian Transmitting Power: 2. ...