GP 27a High Voltage Remote Control Battery. Also Known As A27 Or Mn27 Battery And Commonly Uned In Many Security Devices. Gp Alkaline Batteries Offers Superior Performance, As Well As Performing At a Wide Range Of Operating Temperatures. Battery Size - 28mm Long x 7.7mm Diameter Voltage - 12 Volt Install By Date - Minimum 2014 Supplied In Sealed Gp Packs Common Uses - Alarms And Security Devices, Car Key Fobs And Alarm/immobilisers, Graphics Tablets, Garage Door Fobs And Remote Controls.