Features: Waterproof, shockproof and durable design, equipped with 4 super bright LED bulbs to ensure safe riding Easy to install: clip the clip to the seatpost, insert the lamp and press the switch button Great for people who usually ride bicycles at night Make your bike a warning bike, make you different 4 Flash mode, the switch button is in the middle of the lamp housing. Both sides are made of transparent high-quality plastic specification: Type: Bicycle Safety Light Material: engineering plastic Light color: red/blue/white/red+blue/white+red Power: Built-in lithium battery/USB rechargeable 4 flash modes: 4 modes: long light / slow flash / sequential flash / flash