Description:                                                                                                                                                
1, 2 HG7881 board motor control chip  
2, the module can simultaneously drive two DC motors or a 4-wire 2-phase stepper motor 
3, the module input voltage :2.5-12V  
4, each channel has a 800mA continuous output current capability 
5, PCB size: 29.2 (mm) x23 (mm)