Usage Tips:Features: Plastic and Metal Material: The Cycling Brake Light are made of good-quality plstic and metal, which are hard and durable. Light Warning: When you brake, this light will turn on (without on or off switches button). With brightness red LED light. Warning vehicles behind to keep safety distance. Adjustable and Practical: The Cycling Brake Light can be installed in V-type brake, stainless steel sheet switches can be adjusted according to different brakes. Convenient and Efficient: The Cycling Brake Light are convenient to install and use.Perfect accessory for outdoor biking. Service: If you have any questions, please free to email us in any timing.. We will reply you as soon as possible. Specifications: Material: Metal+Plastic Color: As The Picture Shows Package Weight: approx.11g Size: approx.3.2x1.5cm/1.26x0.59in Note: Please allow 1-2cm error due to manual measurement. Please make sure you do not mind before you bid. Due to the differences between different monitors, the picture may not reflect the actual color of the item. Thanks! Package includes: 1Pc x Bike Brake Light