Fisher Price Sound And Lights Dual Reciver Baby Monitor Specification.. Baby Monitors and Safety Baby monitors are designed to help you monitor your child and are not intended as a substitute for adult supervision. Check at regular intervals to establish the child's welfare and that the monitor is functioning properly. Features 2 channels. Analogue. 2 parent units included. Portable parent units with clip. Range up to 120m. Volume control. Night light. Sound sensitive light display. Low battery indicator. Each parent unit requires 3 x AAA batteries for portable use (not included). Mains adaptors are provided for both baby and parent unit.