Speedometer Sepeda wireless Sunding SD-546C backlight

Functions:
1,AUTO WAKE UP
2,SPD CURRENT SPEED
3, ODO ODOMETER km/m)
4, DST TRIPDISTANCE
5, MXS MAXIMUMSPEED
6,AVS AVERAGESPEED
7, TM ELAPSEDTIME
8, CLK CLOCK 12H/24H
9,, SCAN
, + COMPARATOR
11, SETTING SPEED SCALEkm/h,m/h
12, SETTING TYRE CIRCUMFERENCE :0mm9999mm
13, SETTING THE LAST VALUE OF ODOMETER/ODO
14,FREEZE FRAME MEMORY 
15,BACK LIGHT
16 ,ANTI-INTERFERENCE
17,AUTOON/OFF