SMAKN&reg; HG7881 7881 2-Channel Motor Driver Module Product Name : Two-Channel Motor Driver Board;Model : HG7881 Input Voltage : 2.5-12V;Total Size : 30 x 24 x 14 cm / 1.2" x 0.94" x 0.55" (L*W*H) Hole Dia. : 3mm / 0.12";Hole Distance : 15 x 10 mm / 0.59" x 0.4" (L*W) Main Material : Plastic, PCB, Iron;Main Color : Green, Blue, Black Weight : 7g;Package Content : 1 x Two-Channel Motor Driver Board