Overview: No wiring required 120 db Instant Alarm Infrared ray alarm can send out sounds of alarm now for one second while measuring to the defense area to there are personnel to move, realizing reporting to the police & is frightened & hindered the function. Adopt pair have infrared sensor cooperate with special-purpose to deal with special-purpose to punish the integrated circuit while being infrared, have wrong report rates low, high, high characteristic of performance-cost ratio of dependability, suitable for the family, office, courtyard, & the guarding against theft of the place report to the poice & use the shop along the street. Specification: Weight Approx:64.8g Size Approx:9 x 5.5 x 4.2