The VARTA CR2450 lithium button cell, article 064501014021, is a compact single-use battery for devices designed for this cell size. The listing identifies it as a 3 V CR2450 battery.
Each cell has a stated capacity of 560 mAh and measures 24.5 mm wide by 5 mm high. Its coin-cell shape suits equipment with a matching battery compartment.
The blister contains 2 batteries, so it provides a pair of replacement cells for compatible devices.