A third of alkaline batteries get thrown away with usable power still left inside them. Ultra Power is the only battery with POWERCHECKa, an in-built tester that lets you know how much power is left, so you get the maximum value out of your battery. Ultra Power provides optimum power for devices such as digital cameras, photo flashes, toothbrushes, cordless shavers and trimmers. The only battery with POWERCHECKa! Ultra Power is also the only battery with POWERCHECKa an integrated tester that always tells you know how much power is left.