VDO M2WR - Manual (Page 8)

8
M2 WR
Sleep mode
If you take a break and the M2 is in the bracket,
the computer switches to sleep mode after five minutes.
If you set off again after a break, the VDO M2 has an
auto-start function.
The VDO M2 instantly switches back to the function mode
and the current speed are once again displayed.