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|High Tech Pet Ultrasonic Collar Replacement BatteryThe High Tech Pet Ultrasonic Collar Replacement Battery is the replacement battery for the Humane Contain MS-4 and MS-5 training collars. Its long life lithium cell allows this replacement battery to last up to 3 months. That give you and your pet up to 3 months of uninterrupted training allowing your dog to retain their new found discipline easier and longer.This replacement battery is not compatible with the MS-2 or MS-2A training collars.|