IQOS 2.4 and IQOS 2.4 Plus are extremely similar to the original IQOS device, however the updated versions introduced multiple design improvements including a sturdier blade, lid locking magnetic mechanism, and the option of Bluetooth capacity on 2.4 Plus (albeit not many individuals used Bluetooth as the program and corresponding app were poorly designed and explained). With the launch of the IQOS 2.4 Plus line, Philip Morris also released merchandise designed to customize and personalize IQOS devices (compatible with original IQOS, IQOS 2.4, and IQOS 2.4 Plus). Consumers in some countries had the choice of 12 HeetStick holder cap colors. There were also several limited edition kits sold, including a matte red, matte pink, and metallic blue. During this time, PMI also began to sell IQOS accessories including; leather pouches, folios (carrying case), trays, and car trays.