The deluxe version will still detect a baby s slightest movements even while she sleeps and sound an alarm if no movement whatsoever is detected for 20 seconds The NEW Deluxe Angelcare model operates on both 900 MHz and 2 4 GHz frequencies The sound monitor operates on the 900 MHz frequency so there is no interference from 2 4 GHz equipment The monitor has 8 channels and an 820- range