Upgrade to the ultimate sound experience with 45mm speaker set and matcing software.With a standard 3.5mm jack, these speakers fit practially any communicator on the market, no mater what brand.Owners of cardo freecom and packtalk series will enjoy extra boost with the new jbl sound processor and firmware.Not a freecom or packtalk owner? no worries; this powerful hardware will still drive your headset audio performance to new heights.