... 7" Wired Video doorphone DH-2801M11Simply features:1,7"inch display screen2,CMOS camera3,Light Source at Night: Infrared LED 4,Video intercom ... ,unlocking,monitor functions5,handfree monitor6,Ring Tone: 16 chord ring tones 7,Display Screen Pixel: 480*234Specifications (Indoor ... W)*32(D)mm Weight: 500g Weight of Power Adapter: 140g Intercom ... PAL or NTSC Size of Lens: 3.6mm Angle of Lens: 92° ...