LOOPACELL 4lr44 6 Pcs 6v Battery for Dog Training Shock Collar Loopacell Brand 4LR44 batteries Replaces PX28A A544 2CR1/3N And all Equivalents Super Fresh, Top Quality, Works for toys ,Watches, Cameras, Calculators, Car Security Alarm, Keyless Car Remotes, Organizers, Computer Equipment (memory backup battery) CMOS