Work efficiently with no fumbling for bits. The WX254L includes rapid-reloading technology allows you to change bits with a single slide. Easily switch between bits by simply moving the screwdriver's slide back and then forward to activate the auto bit shift. Ideal for the avid tool guru and DIYers alike it is handy for use around the house to tighten loose screws on furniture, cabinetry, woodwork, and more. The 4-volt maximum lithium-ion battery holds its charge for months, so it's always ready to use.