Wireless Voice Intercom Doorbell 2 Way Talk Monitor Unit Smart Home Security (White) Product is shipped based on color or size of main product page image.<br/ >Wireless Voice Intercom Doorbell 2 Way Talk Monitor Unit Smart Home Security Door Bell - Doorbell (White) Features: *Wireless smart voice doorbell, talk with visitor via two-way voice intercom, let you know who is visiting your home and talk to them and let them know I'm coming, please wait. *1 receiver and 1 push button, talk between receiver and push button via wireless connection in wide range (outer bell: 200m, inner bell: 5-50m without any obstacles), stable transmission signal to make the voice clear. *Receiver supports rechargeable battery, transmitter supports 3 alkaline batteries up to 4 months approach (3*transmitter alkaline batteries are not included). * It is widely used for office and home, knowing who is outside, and convenient for the elder who needs a lot more time to open the door, very convenient. With 15 different ringtones and 3-level adjustable volume. * Easy to install and use, visitor presses the outdoor doorbell, after ringing, you need to press the button on the receiver once to connect, then press and hold to talk, release when finished. Specifications: Indoor unit input voltage: 5V 1A Outdoor unit power supply: 3 alkaline batteries (1.5V x 3) (not included) Indoor unit power supply: Built-in lithium battery (included) Wireless frequency: 467 MHz Ringtone: 15 Options Volume Range: 3 levels Transmission distance: outer bell: 200m; Inner bell: 5-50m (without any obstacle) Waterproof: NO waterproof function Outdoor unit running time: 4 months (approaching) Indoor unit operating hours: 24 hours (approach) Colour: white Material: Plastic + ABS Operating temperature: -20 to 55 Package Information: Package Size: Approach 16.3 x 14.5 x 4cm / 6.4 x 5.7 x 1.6 inch Package Weight: Approach 261g / 9.2oz Package List: 1 indoor unit 1 outdoor unit Note: The data is all measured manually, please allow 1-27cm error, due to the difference in light and display, there will be a certain color difference, the actual object received shall prevail.Note: The data is all measured manually, please allow 1-3cm error, due to the difference in light and display, there will be a certain color difference, the object actual received shall prevail.