Item Type: Bike Taillight Pocket Weight: Approx.189g/6.7oz Material: Carbon Fiber Rainproof Fabric Style: 226 Basic All Black Without Standard Battery Capacity: 200mA Waterproof Rating: IP44 Light Mode: Long Bright, Flashing Battery Type: 1 X CR2032 Button Lithium Battery (with Built in Battery)Package List 1 x Bike Taillight Pocket Life grade waterproof, please do not soak in water for a long time. 1With Taillights: With high brightness LED taillights, safe riding at night is guaranteed. 2IP44 Waterproof: Fabric is easy to dry, so you don't have to worry about it in rainy days, and it still shines. 3Scope of Application: Bicycle taillight bag is suitable for mountain bikes, road bikes, folding bikes, station wagons, etc. 4Rear Cover Gear Button: Light can be easily adjusted by pressing tail cover button, and the light can be switched between lighting and flashing by short pressing. 5With Built in Battery: Long battery life, built in 1 button batteries, only need to open the tail cover to replace the battery when used up.