6V battery for Perimeter® Ultra Comfort, Pet Stop® UltraElite, UltraElite 2, UltraTuff collars, PCC 200, and PCC 200-PRO (collars pictured below). 6V, 170 mAh, Lithium. 90 day guarantee. 6 year shelf life. (2 batteries included, see pack of 6 listing for bulk pricing)