Simple step and direction control interface,Take anti-static measures before you use the A4988 modules in case of short-circuitFive 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 AAdjustable current control lets you set the maximum current output with a potentiometerIntelligent 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 protectionColour:Photo ColorMaterial:plasticPackage Contents:5 * A4988 Stepstick Stepper Motor Driver Module (with PINs)5 * HeatsinkOnly the above package content, other products are not included.Note: Light 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.