Replaces chemical light sticks and is the same sizenEntire lens glows super brightnAvailable in constant on and flashing modelsnLess ThanstrongGreater ThanLazer-Stik Battery Powered Marker Light, Constant-OnLess Than/strongGreater ThanLess Thanbr /Greater ThanThe Lazer-Stik Battery Powered Marker Light, Constant-On is a direct replacement for chemical light sticks that can be equally useful in all-weather conditions. It works in temperatures where chemical light sticks cannot. This light is reusable, environment friendly and reliable. This dependable and impact-resistant light is visible up to 1500 ft. (500 meters) away on the surface making it an excellent-choice as a signal Device. This rugged waterproof light has a handle that forms a comfortable grip as well as an attachment tool. Even with its great visibility, it does not affect the natural night vision of the diver. It comes equipped with a Nylon Line Lanyard for Easy-Attachment to Diver or a Divers Gear. If going to deep waters has been on your mind lately, get the Lazer-Stik Battery Powered Marker Light, Constant-On!