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 feet. The parent’s unit features volume control, sound lights, out-of-range indicator, convenient belt clip, rechargeable battery and a charging base. The baby’s unit has a battery compartment that holds 3A batteries (not included) in case of power outages.