VTech Safe & Sound digital audio baby monitor system, model DM221-2, includes one baby unit and two parent units for multi-room monitoring. This system features DECT 6.0 digital technology for clear transmission, eliminating background noise and providing a secure, encrypted connection. Key functions include a backlit digital display on the parent units, five-level sound indicator lights, two-way talk-back intercom, and a built-in night light on the baby unit. The portable parent units include belt clips and operate with the included AC adapters or rechargeable batteries (not included).