Strauss Cycle Mobile Phone Holder with Mount Bracket, (Black), Gel Seat Cover (Black) and Bicycle Speedometer, (Black/Red) Double clamps with silicone mats to hold your phones or other devices and protect your devices. An adjustable clamp design on the pedestal, convenient installation onto different bikes. (supports those handlebars, the diameters of which are between 15mm and 30mm.) Thick pad with shock absorption function and soften the riding, inner side the seat cover with gel-point, ensuring the seat does not slip after installation. With 3d anti-slip granules on the back, necessary tool for your outdoor cycling. Multi functions with auto sleep and wake-up its records speed in mph/kmph, riding time, distance, scan, maintenance alert. Distance speed tracking and clear large display as the wonderful percent wireless sign showed. 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