Digital. 52 channels. Video. Portable parent unit. Range 150 metres (line of sight). Out of range indicator. Volume control. Night light. Sound sensitive light display. Music. 3 melodies. Monitor size 2.36 inches. Colour monitor. Low battery indicator. Parent unit requires 1 x lithium battery (included). Baby unit requires 4 x AAA batteries (not included). Mains adaptor provided for both parent and baby unit. 1 parent unit. VOX feature.