This collar is compatible ONLY with Perimeter Technologies brand Pet Fence System and is NOT compatible with ANY Other brand! Purchase an additional Perimeter brand dog fence collar receiver to add to any Perimeter brand dog fence kit. This collar can be used as a replacement for a lost receiver or to add an additional dog to your system. Perimeter brand dog fence kits will support any number of dogs. Features: 5 Independently Adjustable Correction Levels Waterproof Limited Lifetime Warranty Designed and manufactured in the USA Extremely small light weight receiver weighs in at 1.1 ounce Metallic infused rubber Comfort Contacts for safety and comfort Measures: 2" x 1.25" x 1" Includes: One waterproof collar receiver Comfort Contact Probes Additional Rubber Comfort Contact tips Long Hair Steel Contact Probes Non-correction long and short training probe covers High quality adjustable nylon collar Polycarbonate Collar Receivers: Polycarbonate plastic is a lightweight, high performance plastic which possesses a unique balance of toughness and dimensional stability. Perimeter brand dog fence collars use polycarbonate plastic to make them resistant to damage from dog chews. Polycarbonate is frequently used in situations where safety and performance are a must such as external jet aircraft parts, the space shuttle and many military applications. Why trust the safety of your dog to anything less? Waterproof Collar Receivers: The craftsmanship that goes into every Perimeter brand dog fence is so good they offer the only battery replaceable waterproof collar receiver on the market. Perimeter brand receivers will continue to function without issue when completely submerged in water. Have a pool, pond or take your dog to the lake? Take your Perimeter dog fence with you. Replaceable Lithium Ion Battery Technology: Lithium Ion technology offers three times the gravimetric density of nickel metal hydride technology which provides lighter batteries with increased run times. Replacing batteries not only provides the ability to instantly renew the collars power supply should you forget to recharge it also provides a consistent duration for battery life as opposed to the diminishing lifespan of a rechargeable cell. Most Humane Contact Points: Comfort Contacts by Perimeter offer the most comfortable solution to create contact with your dog. Conductive metal infused rubber provides significant protection against pressure necrosis, a condition which occurs when a dog either has a negative skin reaction to metal touching their skin or the collar is left on for a prolonged period of time. Soft conductive rubber contacts allow the contact to remain constant keeping your dog safe at home with utmost is comfort. Auto Safety Shut-off: Perimeter brand dog fence systems feature a built in safety mechanism to automatically shut off after 20 seconds of correction. This safety features ensures no unnecessary correction for dogs who may be in the boundary field and panic or for those crazy kids who think it might be fun to lay down in the containment field. Should this happen they will only have to endure 20 seconds of discomfort; hopefully enough for them to learn their lesson. The system will automatically reset following its removal from the field. Seamless Warning Tone (Anti-Linger): Perimeter brand dog fence systems avoid excessive battery drain from those dogs smart enough to sit in the warning area until the receiver battery is dead. Perimeter software seamlessly moves your dog from a warning tone to a very low level of correction 1 second after entering the warning tone area to avoid premature battery drain as well as to help promote the seriousness of their boundary. Allowing your dog to spend excessive amounts of time in the warning tone area will condition them to not take the fence as seriously as they should. Additional time in the warning area will promote testing the fence more frequently causing shorter battery life. Perimeter products are designed and manufactured in the USA. Perimeter Technologies is proud of our heritage as some of the original dog fence industry founders as well as our future as a domestic manufacturer of premium dog fence safety products. Why send your hard earned dollars overseas? Why trust the safety of your dog to anyone less than your fellow pet loving Americans?.