Tomy Walkabout Classic Advance Monitor: Advanced monitoring, excellent clear reception between parent and baby unit. The baby unit provides a secure link to the Parent Unit. This means that sounds your baby makes cannot be picked up by any other monitor in the area. When the power saving feature is activated the baby unit will only transmit when your baby stirs. Mains or battery operated. Talk into the Parent-Unit to give immediate reassurance. Features: Sound sensitivity light display 4 channels Night light Fully portable Volume control Low battery waning Range – 300m 2 Year Guarantee