Fanso K-305177 Siren Battery Twin Pack for Visonic MCS-740, SR-720, SR-740 and SR-740

The Lithium Battery is an extremely energy dense battery that comes in a twin pack.  It offers long lasting operation, making it particularly suitable for use in intruder alarm external sounders. Compatible with: MCS-740, SR-720, SR-740 and SR-740 HEX Powermax/PowerMaster and Risco Lumin8

This single use 3.6 volt battery has a capacity of 3500mAh and is leak resistant.  Lithium has a longer discharge curve than most alkaline batteries, meaning that the K-305177 can retain its charge for up to ten years for longer shelf life and home storage.