The Fisher-Price Time for Sleep Monitor with Dual Receivers features a new contemporary look with the addition of a naptimer and clock to already-great 900 Mhz performance. It features 900 ft range and 4 change to ensure a clear channel can be found. A digital nap time and clock keep track of baby's sleeping habits. The nightlight on the transmitter has a time out. It also features a low battery indicator and nightlight indicator on the receiver. Sounds lights are on both sides of the receiver so mom and can 'see' sounds even when out of earshot. Volume is easily adjusted with a mom-friendly knob and the receiver can be powered both AC/DC. 2 receivers let Dad or Grandmas listen in too - or allow to have one handy in another room. All plugs have energy saving adaptors.