Thanks to two-way communication, Top Digital Video USB enables parents to monitor and talk to their infants at any time. With voice activation, digital zoom, camera and video, screen light dimmer control, and night vision to see you while you sleep. Additionally, it has an MP33 connection to add more songs and six lulls to help soothe the infant. They run on power as well as batteries. 150-meter range, roughly. You can set date and time, five reminder signals, and organize the list of internal contacts to save the most used phone numbers.