Our wireless intercom can work up to 300 meters in an open field without walls or metal walls. Please note that aluminium doors and other WiFi signals can reduce the effective range between the two devices. Note: The outdoor unit must be equipped with a rain cover to work properly. The range may vary depending on the environment. The outdoor unit is set up a built-in battery and it can also be powered directly by an adapter. For easy use, we recommend using the adapter for direct power supply. The indoor unit also has a built-in battery and can be powered directly through an adapter. The outer station has a function for door opener, so it is possible to open the door on the indoor station, an existing door opener button can be integrated in the installation. The station has the function, water column with water reaches IP55. The walkie talkie has a tamper evident alarm. When someone tries to destroy the outdoor device, the indoor unit and the outdoor unit will sound simultaneously. The product is easy to set up and there are 16 ringtones to choose from. The outdoor device is equipped with a high-resolution camera, the indoor unit can be displayed high resolution and realise active monitoring. Features six built-in 850nm white light fill lights, so that the outdoor environment is clearly visible even in the dark. Has a high-quality