Angelcare AC 401 Movement & Sound Monitor: 1 Unit This award-winning baby movement & sound monitor system is both pretty and practical. Slide the Sensor Pad under the crib mattress and its motion detectors will pick up the slightest movements, whether baby is sound asleep or wide awake. Plus, like music to your ears, you'll hear every little sound coming from baby's room on your portable Parent Unit, which features a full colour digital display, nursery temperature display and other extras designed to give you the peace of mind you need to get a good night's sleep too. Sweet dreams everyone! Features: Under-the-Mattress Movement Sensor Pad - Senses each and every one of your baby's movements and will sound an alarm if no movement is detected after 20 seconds. So you and baby can sleep tight. Full Colour Digital Display- See it all at a glance. The easy-to-read screen on the Parent Unit clearly displays nursery room temperature and Sound Lights, as well as your various settings. Very convenient. Temperature Display and Control- The greatest concern for moms and dads is baby's safety, sleeping alone in the nursery. Is baby comfortable? Is the room too warm or too cold? Your Angelcare AC401 baby monitor displays the temperature in baby's room on the Parent Unit and alerts you if it is too high or too low. Audio Tic Feature- Turn on this feature and your Parent Unit will make a ticking sound to reassure you that the monitor is working even when your baby is sleeping silently. Portable & Rechargeable Parent Unit - If you are like most moms and dads, you take advantage of the moments baby is sleeping to get things done around your home. So carry the Parent Unit with from room to room for peace of mind whatever you are doing. Nursery Night Light- A gentle little glow to guide you when you walk into baby's room. This system operates on the 927 MHz and 2.4 GHz frequency bands. Out-of-Range Indicator- Up to 250 meters/820 ft. (open field between 80 meters/262 ft. and 100 meters/328 ft. (indoor). Sound Lights- So you can see and hear the sounds baby makes. Batteries or Mains Operated- Automatically converts to battery mode in the event of power failure. Portable & Rechargeable Parent Unit: Parent Unit operates with 3 NIMH rechargeable batteries (included) or AC adapter. Nursery Unit operates with 4 AAA alkaline batteries (not included) or AC adapter Low Battery Indicator- The low-battery indicator on the front of the monitor lets you know when it's time to change the batteries. Plus, the system will alert you when the Parent Unit is too far away from the Nursery Unit to transmit your baby's sounds and movements to your Parent Unit. Volume Control & Vibration Alert- Shhhh - it's quiet time. Keep your Parent Unit close by and on vibration* mode anytime the sound of the alarm might be disruptive. *On selected models only. Allows you to select your desired movement sensitivity level. Model #: 401-A-US-1GV*Note: The Sensor Pad can be used with a regulatory standard baby mattress, whatever the size or thickness. However, it cannot be used with memory foam mattresses, dual sided, mattresses with a hollow frame or Purflo mattresses.