Made by High Tech Pet, manufacturer of your Power Pet brand automatic pet door Provides the precise manufacturer designed signal code required to reliabily open your door Every Time Exceeds quality and performance of knock-off brands at a very competitive price Battery included (unlike knock-off brands). Typical 3 - 4 month battery life Water resistant and submersible Adjustable nylon strap included fits most dogs and cats Battery Test Button and LED Indicator. Compatable with the High Tech Pet Collar Boot (ASIN: B0D5P2RC93) to attach directly to directly to your pet's existing collar. Knock Off products have known reliability issues. Don't trust your pet to anything less that a genuine High Tech Pet brand collar USA Based Customer Service: At High Tech Pet we stand behind our products 100%. Our Friendly, Helpful, Human Experts are standing by should you ever need our help. Genuine High Tech Pet collar 3 Pack from the USA manufacturer of the Power Pet door. This 2 piece bundle is a high quality, value priced alternative to poorly made knock-off collars. Unlike the copies, this model emits the precise digital signal developed by High Tech Pet for reliable operation of your Power Pet door. (Lesser collars will not always open the door.) These collars will out perform and outlast the knock-offs. Batteries are included (unlike copied products). One size fits all. Backed by our US based expert customer service team.