â–ºBoot increases drop spec of device one additional foot (4 ft. to 5 ft.) â–ºIncludes one handstrap (SG-TC51- EHDSTP1) â–ºBoot is about 4mm longer than standard boot to accommodate for increase device length for TC52ax units with SE5500 all-range imager. â–ºOnly compatible with TC52ax units with SE5500 Advanced-Range Imager.