Features 1、TWO WAY TALK: Wireless smart voice doorbell, talk to visitors through two way voice intercom, let you know who is visiting your house and talk to them, let them know you are coming or waiting 2、STABLE AND CLEAR: Contain 1 outdoor receiver and 1 indoor transmitter, talk in a wide range through wireless connection, stable transmission signal makes sound clear 3、WIDE APPLICATION: Widely used in offices and homes, knowing who is outside, convenient for the elderly who need more time to open the door, very practical 4、EASY TO INSTALL AND USE: The visitor presses the outdoor doorbell, after getting the ringtone, just press the button on the handset to connect, then long press the call, and release when done 5、TECHNICAL PARAMETERS: Wireless frequency for 467MHz, wireless distance up to 200meter without any obstacles Specification Item Type: Intercom Doorbell Material: ABS Wireless Frequency: 467MHz Wireless Distance: Approx. 200meter / 656.2ft(without any obstacles) or approx. 5 ~ 50meter / 16.4 ~ 164ft(with obstacles) Battery Type: 4 x AAA batteries(not included) Package List 1 x Transmitter 1 x Receiver 2 x Double Sided Sticker 1 x User Manual 1 x Screwdriver