Strauss Bicycle Speedometer, (Black/Red) and Bicycle Zoom LED Torch with Mount Holder This bicycle speedometer is waterproof and works great on rainy days as usual when riding Easy to install and use it is easy to follow instructions, great basic functions of the speedometer and very specific tire size that enable accurate calculations. Portable size, light weight, wide application this bike odometer is only for 1.8 x 1.8 inches (l x w) and 0.18 lb, which is easy to carry and save your space High-quality the torch is made of solid aluminium and reflector by rugged abs plastic You can use 3 x aaa battery or 18650 battery for the flashlight Three light modes free to switch this bike light has three light modes-full brightness/half brightness/flashing.2.5 hours in strong light/8 hours in weak light