SD-581A wired bicycle computer

Instructions:http://www.sunding.com/uploads/SuoMingShu/SD-581A-en.pdfFunctions:
  1. SPD    CURRENT SPEED
  2. ODO   ODOMETER (0.001~99999km/m)
  3. DST    TRIP DISTANCE
  4. MXS   MAXIMUM SPEED
  5. AVS    AVERAGE SPEED
  6. TM     ELAPSED TIME .
  7. CLK   CLOCK (12H/24H)
  8. SCAN
  9. “+” “-” COMPARATOR 
  10. SETTING SPEED SCALE(km/h,m/h)
  11. SETTING TYRE CIRCUMFERENCE : (0mm~9999mm)
  12. SETTING THE LAST VALUE OF ODOMETER/ODO
  13. FREEZE FRAME MEMORY
  14. AUTO ON/OFF
  15. MAINTENANCE ALERT