LightVise™ clamps onto almost any sized tube, providing you with bright, hands-free light. LightVise™ clamps to tubes from ½"-1 ½"diameter without tools, which makes it perfect for your cane, walker, wheelchair, or rollator so you can travel safely. LightVise's™ rubberized grip allows you to adjust its placement and its 6 super bright LEDs emit ample light - perfect for indoor and outdoor use. Requires 2 AAA batteries, (not included). 3¼"W X 2½"L X ¾"H.