2 Pcs Bt168 Universal Battery Tester for AA AAA C D 9v Button Cell Batteries Test standard and rechargeable batteries: 9V, AA, AAA, C, D, 1.5V Button Type Compact size and light weight,easy to carry Easy-to-read color-coded display with "Good", "Low" and "Replace/Recharge" indicators A little arm moves up and down to accommodate the battery No batteries required to operate