Invisible Fence Collar Compatible Battery - Extended Life High Performance Dog Fence Battery for All Invisible Fence Brand Collar Receivers - 7 Pack
PetSafe Stay + Play Wireless Fence Receiver Collar Only for Dogs and Cats, Waterproof and Rechargeable, Tone and Static Correction - From The Parent
Trusted Saskatoon Blog Solange of Invisible Fence Brand of Saskatchewan Answers the Question - Do Your Collars 'Shock'?