... Good Quality: honeycomb aluminum panel , special nano surface,support marker pen writing and erase, durable, not easy to distortion ... ,FCC, International Standard Product,etc3) Wiress Connect PC & Whiteboard, wireless bluetooth microphone4)Built-in Stereo SpeakerIt built in stereo ... speed, get smoonthly operations displayed on the large whiteboard screen, solve the drop-shadow problem. Powerful function ...