Keep the indoor unit away from high temperatures, such as near an oven or in direct sunlight, and high humidity, such as bathrooms and greenhouses. Do not install the indoor unit close to a television - the signals the tv and the intercom use to function can interfere with one another. Do not touch the unit with wet hands. Clean the camera or screen with a soft cloth. Do not use detergent, thinner, volatile or corrosive liquid. To prevent damage, the equipment should be fastened on the wall according to instruction.