This baby breathing monitor is simply one of the most reliable monitor available. Two extremely sensitive sensor pads are set under the mattress, and is controled by a high speed microprocessor unit. If the no movement is detected by the sensors for more then 20 seconds or less then 10 micro-movements per minute, the monitor quickly alerts the parents with a loud alarm. The monitor and sensor feature a green light that indicate movements, a red alarm light and a low battery indicator light, that tells you when it is time to change the batteries. The device is suitable for infants up to age one