1.New Wireless speaker Whiteboard 2.Own R&D software Free ... pen write and operate on the screen, no need special pen, high sensitive, no radiation, safe use, quick ... durable (work 8 years) Projection Surface : Coated with special Nano material, anti-glare, keep clear display and project ... Product,etc3 Built-in Stereo SpeakerIt built in stereo speaker, effectively save limited interior space, as well as ...