... built in 5.wireless microphone Wireless Microphone for Teachers,USB Wireless Microphone,Bluetooth Wireless MicrophoneFor handsfree convenience, the 1090 ... free convenience. Feature:1.Portable,convinient,microphone hands free,USB jack2.Certificate:ISO 9001:2000,Rohs,CE3.Lightweight:30g ... on.6. Remote electronic laser pointer,page turner, USB upgrading.7. Pen designed,instead of any other MIC.8.Lithium ...