The project is designed to fit drawers or mount on the wall. (Including installation hardware) Convenient for your battery to organize and test the battery's charge statusIt can hold up to 72 batteries, such as AAA, AA, C, D, 9 volt, CR and AG13 button batteries. Each size battery has its own slot, you can quickly find the right battery when you need itTestable 3v button battery: CR927 CR1025 CR1216 CR1220 CR1225 CR1616 CR1620 CR1632 CR2012 CR2016 CR2025 CR20321.5V button battery: AG13 LR44 SR441.5V carbon zinc or alkaline batteries AA, AAA, C, D1.2V rechargeable battery AA, AAA, C, D9V rectangular bag It has three indicator lights to indicate the power statusSize: 11.8 * 6.3 * 1.4 inches/30 * 16 * 3.5 cm-compact size, fits most drawers Battery level indicator: Good: All three lights (red, yellow) are on. Weak: Only red and yellow. Replacement: only red light. (The battery current is so low that it can hardly work.) No light: The battery is completely exhausted and the battery is completely useless Note: the battery is not includedWarning: This is not a toy. Stay away from children.