SATISFACTION GUARANTEE: If you are not completely satisfied with our LED lights, simply return them within 30 days for a full refund, no questions asked. DESIGNED FOR SAFETY: These LED lights feature two CR2032 batteries, which help other riders, drivers and walkers spot you in low light or total darkness. The package contains 2 black silicon white lights and 2 red silicon red lights. TWO LIGHT MODES: Each of our lights has two specific usage modes - Highlight and Strobe - and can easily switch between modes for convenience and safety. Silicone Latex Material: We use highly elastic and waterproof silicone latex to make our classic LED bike lights, so they can withstand rainy, low-impact drops. EASY TO INSTALL: Our bike lights can be installed in seconds without any tools, simple and fast. Add an LED light to your bike, backpack, or other area to make your trip even safer.