0.63 in. x 0.63 in. Required Battery for MS-4 Ultrasonic Pet Collar (2-Pack)

The High Tech Pet B-3V1A Battery 2-Pack for MS-5 ultrasonic transmitter collars powers a collar for approximately 2-months to 3-months. The Battery is designed for use only with MS-5 ultra-sonic collar which powers the High Tech Pet power pet electronic fully automatic pet door . the yard barrier and the sound barrier. The battery is lightweight . dependable and designed specially for the MS-4 and MS-5 Ultrasonic Collars and is guaranteed to avoid damage to the collar circuitry.