Easy-to-install wireless intercom, perfect for homes and offices. - Type: Wireless Intercom - Color: White - Accessories: 1 transmitter, 2 receivers - Features: Easy installation, wide-range reception - Uses: For home, for office For the entrance or between the 1st and 2nd floors, as a caregiving aid. Wireless chime door phone. Volume adjustable. Wireless and battery-powered, so no wiring is required. Transmitter: 23A12V battery x 1 (included) Uses 2 AAA batteries per receiver. Various melodies can be changed. Thank you for viewing.