Power supplylithium battery aaa battery operation voltagev3 whats in the boxscrew package users manual 2indoor unit 1outdoor unit connectionwireless power w002 materialabs kit configurationone to two doorbell additional featuressound adjustable intercom non visual doorbell answering modehandheld monitoring timedelay monitoring times005 mountingwall mounting primary applicationdoorbell home welcome elderly pager working temperaturec 2050 2050 talk timeh