Setting the speed unit of ebike meter YL81F 

Through the meter setting page, you can switch the speed display unit of the meter to km/h, or Mph according to your habit.
Step 1: Long press the + and - keys within 3 seconds of powering on the instrument to enter the instrument setup page
Step 2: Select 02P
Step 3: Set the speed unit, "00" stands for km/h, "01" stands for MPH.
Step 4: Press "i" key to save and exit.
Step 5: Restart the meter