Features: Wireless connection, no wire needs, achieve a two way intercoms between the doorbell and phone. Reals time mobile phone, support two-way calls, photos, recording, caring for your family makes you more secure. video doorbell camera has night visions, can automatically switches between day and night. The doorbell can be controlled by APP, automatical work model, intelligent and portable. Portable in size and weight, convenient to install and remove. The door chimes kits is very easy to install, no wires are needed, just plugs the receiver into an electrical outlet and stick the transmittersto the external wall. Specifications: Material: Alloy Size: As Shown In The Picture Charging power supply: DC5V Audios encoding standard: G711. A Day and night switching mode: automatic light control: automatic, sensitivity level adjustable light wavelength: 850nm Mobiles detection: supported, with adjustable sensitivity level Connection method: 2.4GHzWiFi Power supply method: battery powered Battery level detection: supported, voltage belows 3.4V, unable to wakes up Working temperature: -10~45 ℃ Working humidity: ≤ 95% Package Includes: 1x Wireless Doorbell note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.