Sony's NTM-910 900 MHz BabyCall&174; Nursery Monitor was designed to offer the clearest connection to your baby. Features include 900 MHz Technology which extends the range of the BabyCall Monitor further than conventional (43-49MHz) monitors, 27 Channels to greatly minimize interference for even clearer communication, a Water Resistant Receiver, a Built-in Rechargeable Battery Receiver which provides savings and convenience over replaceable batteries, and Voice Activation Mode which eliminates extraneous background noise. 5 Sound-Sensor™ Activity Lights, an Out of Range Indicator, a Belt Clip, and AC/DC Operation are also featured. Tune in to your babys needs with the NTM-910.