Renesas RL78/I1A User Manual page 5

If smoke or an abnormal smell or sound is emitted or if overheating occurs, promptly
switch off the board power and unplug the AC power supply.
Using the board in such a state poses a risk of fire, burning or electric shock.
Cautions
Do not use or store this board in any of the following locations.
- Environments with excessive water, humidity, steam, dust, fume, etc.
- Environments where static electricity or electrical noise is readily generated.
Such influences can lead to electric shock or product failure.
If liquid enters the board, disconnect the power supply, and consult your dealer or Renesas
Electronics sales representative.
Even if the unit appears to be dry, internal moisture may remain.
Do not directly touch LEDs on this board.
Doing so may cause product failure.
To prevent static electricity damage, guard against static discharge when touching metal
parts such as the connector.
Static electricity can cause product failure.
Warning
Caution