* * * Different functions. **Wu398 has various functions, including impact drill, multifunctional scissors, pliers, etc. Wu399 has functions such as impact drill, angle grinder and engraving machine.
* * * Different shapes. **Wu398 is chic, fashionable and generous, while Wu399 is common.
* * * The texture is different. **Wu398 is thicker and Wu399 is lighter.
For specific information about these two products, please consult the official staff of the brand for relevant information.