Strauss Bicycle Flash Tail Light with Laser, (Black) and Bicycle Speedometer, (Black/Red) The 5 led and 2 red laser beam bicycle safety light creates a virtual lane around your bike, helping to protect and keep you safe from incidents during night-time cycling or in the dark Upper bright 5 led lamp 2 laser has 260 degree wider visibility and 2 laser creates 2 lines around your bike, helping to protect and keep you safe Multi functions with auto sleep and wake-up its records speed in mph/kmph, riding time, distance, scan, maintenance alert 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 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