The Secure Sounds™ 2.4 GHz Digital Monitor from Summer Infant is a great addition to any home and offers a private connection between you and your baby. The 2.4 GHz digital technology eliminates interference and provides a secure and private transmission. The digital technology automatically selects a free and secure channel so you only hear your baby. It allows parents to monitor their baby in the nursery from any part of the home within 600 ft. The Parent’s Unit features volume control, sound lights, out of range indicator, convenient belt clip, rechargeable battery, and a recharging base. The Baby’s Unit has a battery compartment that holds 3 “AAA” batteries (not included) in case of power outages. Features: Auto-channel scanning selector finds the best channel 2.4 GHz digital technology eliminates interference and provides a secure and private transmission Parent’s Unit includes a recharging base and rechargeable battery Child’s Unit (transmitter) has back-up battery pack in case of power failure Great contemporary styling 2 A/C adapters Sound lights Volume control 650’ range and out-of-range audible indicator Low battery indicator Belt clip for portability