Description This item is manufactured with premium material for durable and long lasting use. It is widely used in 3D printers and small CNC machines. And it can adjustable current control lets you set the maximum current output with a potentiometer. Features - Color: Green.- Material: Electronic Components.- Size: About 2 x 1.5 x 1.5cm.- Five different stepping resolutions: full, half, 1/4, 1/8, 1/16.- Made of material, it is durable and long lasting use. Simple step and direction control interface.- A4988 driver board is widely used in 3D printers and small CNC machines.- Adjustable current control lets you set the maximum current output with a potentiometer.- Crossover-current protection, Load short-circuit protection, ground fault protection.Packing list: 5 x A4988 Compatible Stepper Motor Driver Module with Heat Sink for 3D Printer Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.