Listings show common pack sizes of 2-count, 4-count, and 6-count packages.
Descriptions and reviews list common uses such as key fobs and remotes, medical devices (glucose and heart monitors), trackers and watches, toys and games, and keyless entry systems.
Product listings vary, citing storage life of around 10 years in some descriptions and up to 12 years in others — generally a 10–12 year range is reported.
