Designed specifically to prevent damage if accidentally installed incorrectly, , This battery has been designed by the developers of the original Fully Automatic Power Pet Doors and safely powers your MS-4 and MS-5 electronic pet collars. Typically powers your MS-4 and MS-5 collar for 3 months, and has a shelf life of years. Also sold in 1-pack, 2-pack and 6-pack.

NOTE: This battery is required for all of the new High Tech Pet MS-4 and MS-5 Digital Ultrasonic Collars. Please ensure that you order ONLY the B3V1A battery for your MS4 or MS5 collar.