General The HC202 is designed to be used to as a component of a fire control system compatible control panel. It is a dedicating addressable call point for installation on the 2-wire communication circuit providing both signaling of alarm to the monitoring control panel and local led indication of activation. The HC202 is designed for indoor application. It is not intended for use in an externally exposed or haz-ardous location (refer to your supplier for product recommendations should these applications be involved). If the manual call point is connected with the polarity reversal wire, it will not operate normally. But, other units can still operate as usually in the loop