High Visibility lights - Shoot it at dusk and with 20+ hours of battery life, you can still find your arrow the next day. 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. Piston driven contact switch ensures L.E.D. illumination every time. Waterproof and shock resistant design is second to none. LONG LASTING LITHIUM BATTERIES - Shoot it at dusk and with 20+ hours of battery life, you can still find your arrow the next day. Nocturnal – S Fits Arrows: Carbon Tech - Cougar, Whitetail, Cheetah, Panther, Hippo, Rhino, Safari. Victory - VForce, VForce HV. Carbon Impact - Titan, Fat Shaft, Stealth, Trophy Hunter, Carbon Youth. Carbon Express - Maxima, Maxima Hunter, Maxima 3D Select, Aramid-KV, Mayhem, Mayhem Hunter, Pile Driver, Pile Driver Hunter, Mutiny, Predator II (4560 and 6075 only), Terminator, Terminator XP Select, Terminator Lite Hunter, Heritage (150, 250, 350), Rebel, Rebel Lite, Rebel Hunter. Carbon Revolution - Speed Pro, Speed Pro MAX. Easton - Power flight, Flat line, Flat line Surgical, Light Speed, Fat boy (w/S-UNI Bushing), XX78 (w/S-UNI Bushing), XX75>1916(w/S-UNI Bushing), X7 Cobalt, X7 Eclipse>1914 (w/S-UNI Bushing). Beman - Beman 9.3, ICS Hunter, ICS Hunter Elite, ICS Camouflage Hunter, ICS Hunter Junior, ICS Bow hunter, ICS Venture. PSE - Radial X Weave, Hunter Radial X Weave, Bow Madness Radial X Weave, Black Mamba Radial X Weave.