SUNDING SD-548C LCD Wireless Waterproof Bike/Bicycle Computer Odometer Speedometer Functions: SPD Current Speed ODO Meter (0.001~99999km/m) MXS Maximum speed DST TRIP DISTANCE AVS AVERAGE SPEED TM ELAPSED TIME CLK CLOCK 12H/24H Scan "+","-" Comparator Setting type Circumference:(0mm~9999mm) Setting Speed Scale(km/h,m/h) Freeze frame memory Auto ON/OFF Specifications: Color : Black Dimensions : 12.00 cm x 7.00 cm x 4.00 cm Weight : 97g Packing list: 1 x Bicycle computer 1 x Wireless Transmitter 1 x Magnet 1 x CR2032 battery 1 x Cable tie