Review on 🔆 LE LED Bike Light: Powerful Clip-On Taillight with 3 Lighting Modes for Safe Cycling - Batteries Included by Russ Freeman

Seller claims these lights are IPX4 waterproof. Maybe they are, but they're not very waterproof. I had my two weeks long; I went for a long run today and when I came back the light was on. I took it apart (four screws holding the back cover in place plus four screws holding the circuit board in place) and there were beads of sweat on the circuit board. I washed it under the tap, blew the water out of the counter and let it dry. Now it works fine. So you can expect really bright light, but if you ever expose it to water - even small amounts of water - it can get stuck. If so, you can probably fix it by taking it apart completely, washing it thoroughly, and letting it dry. However, you must do this as soon as possible; it can rust quickly if the batteries get wet. Update: I used a toothpick to carefully apply a thin coat of silicone sealant to all mating surfaces before reassembling the light; This involved removing the little rubber ball covering the switch and kitten where it is. I waited 24 hours and then held the flashlight six inches under water for one minute; not a drop came out.