Keep your radio from swinging wildly when you're on the job. Without a strap, you'll have a flailing radio at best or a patient with a Motorola imprint on their forehead at worst. Seriously, ask my academy classmate Mike (not the Mike from theflashlight holder). He took off his radio strap so as not to hit the scenario patient with it, and earned us a ton of pushups after he left the room without his radio. Don't be like Mike.
Customize the leather color, stitching thread color, and hardware color to truly make it your own.