Petsafe Radio Fence Systems Extra Receivers -ultra Light Receiver

I think some of the other reviewers here are confused about this product.
It does what it is suposed to do and it is for small animals. It works on cats too, not just dogs. The only con is the lock for keeping the batteries in was poorly designed and they can fall out and the lock will get lost. We have had our for about 3 years now and one is zip tied shut because the lock fell off. They are really light and the batteries last about a year in them.

Pros: It works great

Cons: batteries fall out easily

I DO NOT ADVISE THIS FOR A LARGE STRONG DOG. ONCE THEY KNOW THAT THEY CAN GET OUT WITH A LITTLE ZAP....GONE. ALSO OTHER STRAY DOGS CAN GET IN.

Pros: UNDERGROUND

Cons: NOT FOR LARGER STRONG DOGS