MN21 security battery Blister Packed (1) Will also replace other batteries (Direct replacement): A23 K23a LRV08 L1028 RV08 23a MS21 E23a V23GA GP23a 8LR932 8LR23 VR22 8F10R Many uses including Car Alarms, Home security devices, Gargae door openers, Lighters etc. Battery Type: Alkaline Battery Voltage: 12.00 V Battery size: Blister Packed (1)