1---Easy to apply: this front and rear bike light can be installed and fastened in seconds without any tools or other equipment, which ia convenient for you to apply and keep the lights secure and firm, help you to guide your way at night 2---Durable material: our multi purpose bike LED lights are made of LED lamp beads and silicone, durable and not easy to break or scratch, which can serve for a long time, the light is also simple for you to carry and take down due to the silicone elastic buckle 3---What occasions to use: each waterproof bike headlight and taillight has waterproof design and proper size, which is suitable for most kinds of bicycles, bike, mountain bike, city bicycle, kids bike and so on; It can be also applied for your helmet, baby trailer, dog collar or other places 4---6 colors: yellow, green, white, blue, red, black, you can choose the colour according to your preference. Light mode: full Light. --------------------------------- Features: 1. Water resistant shower proof design - is not afraid of rain flooding 2. Install or remove without any tools you can get 3 seconds 3. One-Touch switch design, easy operation 4. All the sustainable use of light 45 to 70 hours 5. Scintillation sustainable use of 160 hours 6. Using two button batteries for each light How do you open the light to replace the batteries ----Stretch off the rubber from the inside and you will see the cap that twists off to replace the battery. The silicon is covering the battery. Take out the silicon covering to expose the battery. It is not hard and it can be replaced easily.