1.Wireless speaker & wireless microphone 2.Wireless writing 3.infrared multi touch 4.Manufacture 5.material ... radiation ,2) Good Quality: honeycomb aluminum panel , special nano surface,support marker pen writing and erase, durable, not easy ... ,FCC, International Standard Product,etc3) Wiress Connect PC & Whiteboard, wireless bluetooth microphone4)Built-in Stereo SpeakerIt built in stereo speaker ...