ROISCOK Electronics LTD. is an intruder alarm products manufacturer in shenzhen, China, since 1989. We supply high quality products as follows: A. Control Panels; B. Wired Detectors,including Dualtech/Ceiling PIRs/Curtain PIRs; C. Wireless PIRs and receivers; D. Environmental Detectors,such as Gas/Smoke/Vibratory Detectors/Strong Electricity Inbreak Detector; E. Magnetic Door Contacts; F. Beam Sensors series; G. Siren series; H. Accessories; Http://www.roiscok.com