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
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