A bright yellow flashlight so it is easy to see that has a wrist strap. Runs on 3 AAA bateries that are not included. The power switch is the black ring you see on the flashlight.You just slide it with your thumb to turn off and on. Works fine under water and is bright above water too. Since it is waterprof I keep it on my boat so I am sure it will work when ineed it. #RankBoosterReview #Sponsored #ThreeTrees https://www.amazon.com/trees-Underwater-Flashlight-Waterproof-INCLOUDE/dp/B073BKD8D3