With a 90-degree coverage area of 40 feet, this fully supervised detector will keep your home secure when you're not around. Upon detection of an intruder, the on-board transmitter instantly sends an alert to the wireless alarm system. With its superior transmission range, this highly accurate unit is able to differentiate between real threats and large pets, allowing your animals to move freely while still ensuring the security of your home. The  Pet-Immune Motion Sensor features patented technologies such as Digital Signal Processing (DSP), "True Motion Recognition" (TMR) and 3D "Target Specific Imaging" (TSI) Cylindrical optics.