This Verbatim Premium CR2025 pack contains four 3-volt lithium coin cells for devices that take a CR2025 battery, such as car key remotes and alarm fobs, watches, calculators, bathroom and kitchen scales, fitness trackers, small LED lights, remote controls and PC motherboards (for the CMOS clock). CR2025 cells are 20 mm in diameter and 2.5 mm thick, and each Verbatim cell weighs about 2.2 g. They are single-use, non-rechargeable lithium batteries, and lithium chemistry gives a long shelf life and stable voltage, which makes them a good choice for devices that sit in standby for long periods. The cells come in a four-pack blister card. Keep coin cells away from children: swallowing one can cause serious internal injury, so dispose of used cells safely.