BTU-4  The BTU-4 allows monitoring of up to four temperature sensors from any remote control system. | TS-1  The TS-1 Transient Suppressor provides surge suppression for your dial-line equipment. |
Silence Sensor  The Silence Sensor makes it easy to monitor the presence of audio with an adjustable delay. | AFD-1  The AFD-1 detects arc and flame in broad daylight from up to fifteen feet away. |
SL-1  When Internet access is unavailable or impractical, the SL-1 extends your LAN to a remote site over an existing serial connection. | LVS  The LVS monitors a single phase AC power circuit. |
TLM  The TLM is a universal lamp alarm relay designed to sense the failure of flashing or steady incandescent beacon lamps or steady side lights. | AC Current Sensor  The AC Current Sensor combines a transformer and a signal conditioner into one package. |