... picture up to 500pcs -FCC,RoHS,CE -Deskstop design Remote control for digital and full-duplex Widely used in villa ,house ,window intercom ... Voice, image transmission3).Full-duplex hands-free call, clear audio and video.4).Visiting key wake up call, standby power-saving ... sleep5).Unlock door and alarm function.6).CE, ROHS , FCC passed7).83 effective communication ...