Waterproof LED Bike Bicycle Head Light + Rear Flashlight, Taillight Combo Water Proof 5 LED 6 Mode Bike Flashlights Long lasting: Up to 150 hours operation with 4 x "AAA" batteries (not included) Two operation mode: Continuous or Flash, change mode by pressing the button on the top Multi-functional: Bike light, Torch, Diving (up to 20m / 66ft.). Etc