What type of battery do I use for ActiveResponse™ Personal Alarm? Applies for the listed products SWIFI-MPRSB, SWIFI-MPRST Answer: It uses a 3V CR2-type battery Related articles How long does the battery last? What Type of Detection Method is Used By the Device Quick Guide: Where to Get the Model Number of a Swann Product Where can I check the camera's current battery % strength? What resolutions will the MaxRanger™ cameras record video at?