Caveats:
1. Board has MOS and other components, has been soldering iron inductance electricity or classic damage, please ensure that the use of the soldering iron has a ground (and plug ground conductive), it is best to wear anti-static gloves to operate!
2. Installation of batteries pay attention not to install the reverse
3. Please select the power supply enough power to keep the board working properly!
4. Board power supply should not be higher than 5V
5.It is normal for the module to heat up when working with high power, please pay attention to heat dissipation.