Mini body, super bright light, no wires tangle, easy installation and universal application make this small brake light one of the most popular product that bike enthusiasts enjoy. It will turn on automatically when you brake. It can be installed on the V-brake and sidepull caliper brake, and other cable actuated brakes without influencing the brake performance.<br><br><strong>Features:</strong><br>Rain repellent, durable, no-wire tangle and handful.<br>For most cable actuated mechanical brakes.<br>Automatically turned on when you brake.<br>Clearly visible brightness red LED light.<br>Powered by a built-in CR1025 button battery. <br>Easy installation with no other tool needed.<br><br><strong>Specifications:</strong><br>Material: ABS &amp; Stainless steel <br>Battery: 1 * CR1025 (Included)<br>Size: 30 * 16 * 31mm / 1.2 * 0.6 * 1.2in (L * W * H)<br>Suitable for: V-brake, C-brake, etc..<br>Runtime: More than 50h.<br>Weight: 5g / 0.2oz<br>Package size: 10.5 * 7.5 * 2cm / 4.1 * 3.0 * 0.8in<br>Package weight：10g / 0.35oz<br><br><strong>Package List：</strong><br>1 * Mini Brake Light