Enjoy peace of mind when you're away from your baby. The NTM-910YLW 900-MHz BabyCall(R) nursery monitor uses the clearest channel available to deliver crisp, clear audio of your baby's actions. The reliable 5 Sound-Sensor(TM) activity lights, out-of-range indicator and low-battery warning ensure that you're informed of vital information at all times. The built-in rechargeable battery receiver means you won't have to bother with continuous replacements. 5 Sound-Sensor(TM) activity lights, out-of-range indicator and low-battery warning keep you informed of your baby's actions and the status of your equipment. A belt-clip is included for the receiver, keeping your hands free for other activities. 5 Sound-Sensor(TM) Activity Lights to alert you when baby is making sounds, when receiver is out of range, and when battery is low Out of Range Indicator beeps and lights up when unit is out of range Belt Clip allows you to wear the receiver as you move about the home, keeping hands free for other activities AC/DC Operation operates on standard household current or supplied rechargeable batteries 5 Sound Sensor Activity Lights, and Out of Range Indicator Alarm Output Power - 120mW (using supplied AC Adaptor), 55mW (using 2.4V DC) Audio Frequency Range - 900MHz Transmitter Dimensions - Width 4-1/4 x Height 4-1/4 x Depth 1-15/16 (106x107x48mm) / 9 ounces (255 grams) Receiver Dimensions - 3-7/8 x 3-7/8 x 1-11/16 (96x96x41.5mm) / 5-5/8 ounces (160 grams)