There is adjustable sensitivity and an alarm will sound after 20 seconds of no movement and an optional "tic" can be played to hear the baby's movements. The sensor pad is attached to an external sound monitor which picks up any sounds made by the baby in the nursery. All sounds and movements are transmitted to the parent monitor, with the option of choosing one of three channels to minimize interference. Lights and a speaker on the parent unit allow you to "see" and hear baby sounds.
The parent unit has belt clip, and operates on rechargeable NiCad batteries, while the nusery unit runs with an AC adaptor and 4 AAA batteries as backup. Unlike the lower model, the nursery unit shows nursery temperature and has a built in night light.