Keep your rangefinder, GPS or radio within reach by attaching it to a tether. 36" retractable Kevlar® cable. Quick-detach system instantly releases device for quick access. Original Sidewinder uses Teflon® skid plates for smooth, quiet rotation of attached device, while Sidewinder EVO uses a dovetail design for no-rattle carry. EVO also features a LeverLock belt clip for attachment to a belt and a rotating mounting system with eight mounting positions.