Features: 1.Two Way Talk: A wireless voice doorbell that allows you to talk to visitors through two way voice intercom, letting you know who is visiting your home. 2.Long Distance Transmission: Wireless connection, stable transmission signal makes the sound clear, and the maximum call distance can reach 200m. 3.Wide Application: Widely used in offices and homes, it is very practical to know who is outside, convenient for the elderly who need more time to open the door. 4.Simple Installation: The kit includes 1pc outdoor receiver and 1pc indoor transmitter, just stick the wireless smart doorbell on the wall with adhesive tape. 5.Simple to Use: When a visitor presses the outdoor doorbell, you only need to press the button on the doorbell to connect, then long press to talk, and release when done. specification:Item Type: Wireless Doorbell Material: ABS Wireless Frequency: 467MHz Wireless Distance: Approx. 200m / 656ft (without any obstacles), 5-50m / 16-164ft (with obstacles) Battery Type: 4 x AAA batteries (not included) PackageList:1 x Indoor Doorbell 1 x Outdoor Doorbell 2 x Sticker 1 x Manual 1 x Screwdriver