Silicone Light: This set of white LED and red LEDs makes it perfect for the front and rear light of your bike. Lightweight silicone LED lights are easy to install. Small, light and bright, so you can use it for commuting to work or school, wheelchair, or dog walking. Battery: Coin type lithium battery (CR2032 x 2), Test battery included; Lighting Pattern: Light Up → Fast Flashing → Slow Flashing → Off; Estimated Lighting Time: 1000 150 - 150 hours (150 hours ( hours (150 hours (150 hours Varies depending on usage environment. How to Use: By pressing the top of the light, it turns on → fast flashing → slow flashing → turns off ◆ Size: Length 1.8 inches (45 mm) × Width 1.6 inches (32 mm) × Height 1.6 inches (40 mm); Weight: 0.8 oz (22 g) (battery included) ● Can be easily attached with a screwdriver on the seat post. AAA batteries x 1 2 pieces (sold separately); There are 7 types of lighting and flashing patterns; Product Size (W x H x D): Approx. 2.6 x 1.7 x 1.4 inches (66 x 42 x 35 mm) (main unit only).