Digital Audio Monitor Dect 6.0 technology. Provides 1,000 feet of range using secure digital transmission. Vibrating sound alert. Get silently alerted of sound from your baby.Talk-back: Communicate with your baby from the parent unit. Night light:The loop on the baby unit illuminates to be used as a night light. Belt clip:Take advantage of the extended range and rechargeable batteries of the Safe & Sound® Audio Monitor by clipping on the parent unit using the built-in belt clip. Peace of mind: VTech Safe & Sound® Audio Monitor gives you peace of mind, anywhere, anytime. From anywhere in the home, hear all of the special sounds your baby is making. DECT 6.0 digital technology provides crystal clear transmission, eliminating the annoying white noise you hear from analog monitors. The only sounds you hear are coming from your baby.