Locked- can provide an abnormal signal when the motor rotates abnormally. The sinusoidal control can be perfectly realized even in a system with limited pulse frequency. Since is widely used in 3D printing, the design of these components is also compatible with existing 3D printer electronic devices. Features - Color: Assorted color. - Material: Plastic, metal. - Size: 2.00X1.50X1.00cm/0.79X0.59X0.39 inch. - Increase the area of the heat dissipation pad. When the driver is working, the temperature will be lowered faster and the short circuit phenomenon will be reduced. - The product is an ultra-silent motor driver module for two-phase stepper motors. - Increases the heat dissipation area, dissipates heat quickly and thus reduces short circuits, and better protects the drive module. - Compatible with existing 3D printer electronics, with a standard step/ interface, it is easy to use. - When the motor is not moving, the motor standby can be dynamically reduced. Package list: 4 sets x stepper