This video intercom can connect to the electric lock.You can open the door with both the indoor monitor and the outdoor camera. The Outdoor Camera Is Equipped With Rubber Gasket Ring, There Is No Way To Leak.It Also Can Works Well Even In Bad Weather. The LED on the outdoor doorbell will light on automatically so that you can see clearly visitors even in the darkness of evening, Make sure your family is safe. The 25 polyphonic ringtones can be switched freely, which is elegant and beautiful.The ringtone and volume can be adjusted to meet your original needs.No longer have to worry about not being able to hear the sound or hearing the sound too loud. When a visitor ring the bell, the monitor will be activated and show the image outside.Press the answer button, then you can talk outside, press the answer button again to turn it off.If you do not press the button after the conversation is finished or if no one answers the call,the monitor will turn off automatically after the 60s., Manufacturer: QAXRZCUCD