Philips Avent DECT Baby Monitor For Child Safety The Smart ECO mode automatically reduces your transmission power and increases battery life. The closer you are to your child, the less power is required for a perfect connection (not available in the US and Canada). The parent unit will alert you if the baby monitor is out of connectivity or if the battery is low, to help you always stay close to your child. Lights are activated to indicate the level of sound in your baby's room, even if the parent unit is muted. Indoor range up to 50 meters *, outdoor range up to 300 meters The parent unit works perfectly DC. For increased mobility, you can also insert the batteries for the cordless unit using parent. You can insert two AA alkaline batteries R6 1.5V non-rechargeable batteries or two AA R6 1.2V rechargeable. Format A baby monitor