ELPA DHS-SM2030 Video Doorphone, DECT Wireless Intercom, No Wiring Required, Automatic Recording, 1 Parent Unit and 1 Camera/Slave Unit Set

Power Supply: 4 AA alkaline batteries (sold separately) or 7V DC power from the monitor parent unit Battery Life: Approximately 8 months (20 seconds per use, 5 times per day, at 21°C) ■Mounting Requirements: Surface Mount: JIS Single-Piece Switch Box (with cover) Nighttime Shooting Method: Visible LED ■Mounting Requirements: Surface Mount (brackets included)