The Audible Battery Tester is designed for persons who are blind or have low vision. The device tests 9-volt, AA, AAA, C, D, and N size batteries. The user places the battery in the tester, then presses a button. As the button is pressed, a continuous beep is heard if the battery has power. The louder the beep, the more power remains in the battery. The Audible Battery Tester also has a light indicator for those who can see.