The gev caf 087026 allows you to have a 2 way conversation with the visitor at your door suitable for a 1 family house the gev 087026 wireless intercom system has a plastic covered outdoor unit with a metal housing to product the unit from rain the mobile indoor unit is delivered with base station and ac adapter as an alternative to battery operation the door station are powered by 12v dc in this case a commercial electric door lock 12 v dc not included can be connected to the doorphon