Features: 3 apartment doorbell, each button corresponds to an indoor unit and does not interfere with each other. Ultra thin touch-tone indoor unit leads the the new trend of color video doorbell, perfectly presenting luxurious style. Hands-free intercom function, electronically controlled unlock function, outdoor monitoring function. Image brightness, chrominance and volume can be adjusted. Explosionproof and waterproof metal outdoor unit supports infrared night view function, simple and convenient wall-mounted installation. The indoor unit has sensitive buttons and a long service life. 16 chord music ringtones are available, bringing you maximum acoustic enjoyment. Specification: Condition: Brand New Functions: Call, monitoring, intercom, unlock, hands-free, ringtone selection Material: ABS + PMMA panel Color: shown as picture Optional Plug Type: AU 110V-240V , UK 110V-240V, EU 110V-240V, US 110V-240V Switch Po wer Supply: AC100-240V 50-60HZ Whole Unit Current: < 800mA Call Delay Time: 120S ± 10% Monitoring Delay Time: 40S±10% Camera Sensor: BYD3003 1/4 420 TV lines Lens: 3.6mm 92° Package List: 3 x Indoor Unit 1 x Outdoor Unit 3 x Adapter 3 x Connection Cable 4 x Screw Bag 1 x 2 core cable 6 x 4 core cable 3 x Indoor unit panel 1 x Outdoor unit panel 1 x User Manual .