ultra-thin design metal external machine two independent hd video intercom doorbell building intercom system low power consumption

performance parameters: display resolution: 840*480 system: pal / ntsc system (choose one); power supply mode: switching power supply ac110-240v 50hz / dc15v 2a; machine current: less than 800ma; call delay time: 120s ± 10%; monitoring delay time: 60s ± 10%; camera sensor: hd color cmos; 700 lines outdoor infrared night vision function: low open 10lux infrared open, quantity: 1 items per l