Water level indicators; Alarms for the detection of inflammable gases; Device for testing the function and effectiveness of smoke detectors, carbon monoxide detectors and heat detectors featuring an aerosol spray; Carbon monoxide detectors; Gas alarms; Burglar alarms; Electronic access control systems for interlocking doors; Overhead projectors; Theft alarms; Smoke detectors; Electrical plugs and sockets; Safety sensors, namely, carbon monoxide detectors, smoke detectors, and combination carb...