Each battery will last as long or longer the real Invisible Fence Brand PowerCap batteries. Compatible with all Invisible Fence Brand R21, R51 and MicroLite electronic dog fence receiver collars. The battery design was approved by the chief engineer at the Invisible Fence Company and are manufactured in a state of the art facility in Pennsylvania under his supervision.

Features:

• 3-volt lithium-ion battery
• Average battery life of 3-6 months
• Rubber gasket provides a water tight seal
• Tamper proof design with coin slot for battery removal