Wireless Panic Button HMJJ100Wireless Panic Button HMJJ100 PC for Series HM2088.Operating Voltage : 9V DCDetecting Range : 8 to 12 meters, 100 degreesOperating Frequency : 315 MHz 433MHzOperating Temperature : -20C to + 60C.This Wireless Panic Button can trigger the Alarm in case of any emergency. It should be placed where it can easily be reached. . Warranty: 1 year against manufacturing defects