The Angelcare AC401 monitor brings you all of the safety and security that the original Angelcare monitor did but with the added benefit of it being a rechargeable monitor! The Angelcare combines a quality sound monitor and a movement monitor in one single system. Whether your baby is awake or sound asleep, Angelcare's under the mattress sensor pad will detect all of your baby's movements even the slightest breathing movements! The sensor alarm works in such a way that if movement is not detected after 20 seconds then an alarm will sound to alert you to the situation. The units comprise of the following 8 channel options Digital colour LCD display on the parents unit Baby's room temperature digital display on the parents unit 4AAA rechargeable batteries included with the parents unit. The nursery unit uses 4AAA standard batteries not included Automatically reverts to batteries in case of power failure Choice of voice activated or continual transmission Out of range indicator o Adjustable sensitivity of the movement sensor pads o Adaptor included o Practical soothing night light on the baby unit There is also a sensitivity switch located at the back of the baby unit which can be used as your child grows and moves off the pad more. The baby unit also comes equipped with a pager, which if pressed will locate you to where the parent monitor is if lost at any time. *This monitor can also be used for twins, 2 Angelcare AC401's can be used at the same time if they are set to different channel codes using 1 parent and baby unit separately from the other parent and baby unit. Please note Parent unit must be charged for a full 15 hours before first time use