What type of battery do I use for ActiveResponse™ Personal Alarm? Applies to the listed products SWIFI-ACTIVEG2A, SWIFI-ACTIVEG2B, SWIFI-MPRSB, SWIFI-MPRST Answer: It uses a 3V CR2-type battery Related articles How long does the CR2 battery last? Where to Find Camera Battery Level What Type of Detection Method is Used By the Device How does the ActiveResponse™ Personal Alarm connect to the Swann Security app? What resolutions will the MaxRanger™ cameras record video at?