Simple step and direction control interface,Take anti-static measures before you use the A4988 modules in case of short-circuit Five different step resolutions: full-step, half-step, quarter-step, eighth-step, and sixteenth-step. Output drive capacity of up to 35 V and ± 1.2 A Adjustable current control lets you set the maximum current output with a potentiometer Intelligent chopping control that automatically selects the correct current decay mode (fast decay or slow decay) Over-temperature thermal shutdown, under-voltage lockout, and crossover-current protection Colour:Photo Color Material:plastic Package Contents: 10 x A4988 Stepstick Stepper Motor Driver Module (with PINs) 10 x Heatsink Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.