Product Description The Ei603C alarm is activated by heat from a fire, not smoke, which makes it ideal for kitchen installations where smoke detectors are prone to nuisance alarms. The Ei603C has a 9V Alkaline replaceable battery The Ei603C should always be interconnected to other smoke alarms in the dwelling or escape routes to ensure that all occupants are alerted to the danger. The Ei603C modular design allows it to be upgraded for RadioLINK functionality with the addition of an RF module. Up to 12 battery powered smoke and heat alarms may be linked using hardwire or RF connectivity. RadioLINK enabled smoke and/or heat alarms can be house coded as a system to prevent communication with other nearby RadioLINK systems.