Apple Find My Airtag MFI Certified (Tag06) Connectivity: Bluetooth 5.2 Battery Type: Un-replaceable CR2450 (battery life is 3 year) Product Size: 31.5x31.5x11.5 mm/ 1.24×1.24x0.45 inch
HyCell Button Cell Battery Pack of 20 Lithium Batteries CR2450 3 V Button Battery for Daily Use in Devices such as Remote Controls, Car Keys, Calculators, Scales, etc.