This Angelcare AC300 movement only monitor is ideal for parents who already have a sound monitor or have twins and require separate movement monitors. A sensor pad will monitor your baby's movements, even the slightest breath, and an alarm will sound if no movement is detected after 20 seconds. The Tic function provides an audible click when movement is being detected, providing peace of mind that the sensor is working and your baby is safe. Requires 2x AA batteries order 1x 203 6267. Age range birth.