NockturnalLighted Nock Description Nockturnal’s exclusive patented linear switch design works every time! No wires or connections. The simple bowstring activated push on switch easily switches off when done and features an extended battery life of 20+ hours. They’re waterproof and can be used in any conditions. The light allows you to easily see your arrow impacts and find that arrow on pass thru shots. Features: HIGH VISIBILITY and LONG LASTING LITHIUM BATTERIES - Shoot it at dusk, and with 20+ hours of battery life, you can still find your arrow the next day RELIABLE - Piston driven contact switch ensures L.E.D. illumination every time. Waterproof and shock resistant design is second to none NO ASSEMBLY REQUIRED - Nocks can go straight form the package to the shaft in fully operational condition. No prep work needed. Just insert it, and you are ready to shoot FITS GOLD TIP ARROWS - with an inside diameter of .246 EASY TO TURN OFF Shot-activated switch won't turn off until reset by the archer. Simply insert our nock tool into the hole on the side of the nock to push the piston back to the OFF position Sport type: OUTDOOR Product Details: Item Package Dimensions L x W x H: ‎5.63 x 4.25 x 0.24 inches Package Weight: ‎0.01 Kilograms Item Dimensions LxWxH: ‎4.25 x 5.6 x 0.35 inches Brand Name: ‎Nockturnal Country of Origin: ‎United States Model Name: ‎Nockturnal Lighted Nocks Color: ‎Red Material: ‎Plastic Suggested Users: ‎unisex-adult Number of Items: ‎1 Manufacturer: ‎Feradyne Outdoors Llc Part Number: ‎NT-102 Model Year: ‎2016 Size: ‎.246" Sport Type: ‎OUTDOOR Date First Available: May 11, 2012