Strauss Bicycle Speedometer, (Black/Red) and Bicycle LED Headlight with Horn 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 ABS material can be stable and durable, 3 LED lamp provides lower power consumption and ultra long lifespan brighter than normal lamps. This light Detachable and adjustable headlamp bracket design convenient for installation suitable for most of bicycles. Bicycle light Battery Type: 3* AAA Battery(Not Included), Application: Most Of Bicycles, Color: Black, Package Included: 1* Headlamp(Battery Not Included), 1* Detachable Bracket Bicycle light Easy to replace the battery only support 3* normal AAA batteries please not to use rechargeable batteries to prevent circuit burned, Dual switch design back switch control