The intercom system is wired and suitable for use in a single-family home. The power supply of the indoor station supplies the outdoor station. Blue LEDs as opt. Advertisement. Illuminated nameplate No relay/transformer is required to operate the door intercom. Surface mounting. Recommended mounting height 165cm. 3 ringtones to choose from. Max. 80dB (0.3m). Assembly instructions The connection between the two stations is made via a max. 70m long cable (two-core 0.75mm²). Do not install in the immediate vicinity of power lines to avoid interference In addition to the outdoor and indoor unit, the delivery scope of the intercom includes fastening material: luster terminal, western plug, bracket, cover plates with 8 screws, screws and dowels as well as power supply Dimensions of the intercom.