Have you ever calculated how fast you can drive or how long you drive everyday? May be you want to calculate but you do not have such kind of tool and the traditional watch is not so accurate. If so you should pay special attention to this multifunction waterproof bike computer. This wireless cycle computer is so powerful in its functions. It can calculate the current speed the maximum speed the trip distance the total distance the average speed and so on. - Model: SD-558A - Color: Silver + Black - Material: Plastic - 2.8" LCD display - Stylish and compact design - Water resistant - Powered by 1 x CR2032 battery (included) - Measures and shows the following information: - SPD (Current Speed) - ODO (Odometer (0.00~9999 km/m - DST (Trip Distance) - MXS (Maximum Speed) - AVS (Average Speed) - TTM (Total Trip Time) - TM (Trip Time) - RTM (Riding All Time) - CLK (Selectable 12/24 hours) - SW (Stopwatch) - Temperature (-20'C ~ 90'C) - TM UP (Trip Time Up) - TM DN (Trip Time Down) - Easy to install all mounting hardware included - Comes with English manual