15W gear motor output speed: 415 0 rpm, 250 0 rpm, 206-0 rpm, 166 0 rpm, 125 0 rpm, 100 0 rpm, 83 0 rpm, 62 0 rpm, 52 0 rpm, 41 0 rpm, 31 0 rpm, 25-0 rpm, 20-0 rpm, 16-0 rpm, 12.5-0 rpm, 8.3-0 rpm, 6.9-0 rpm, 5-0 rpm, fast 415 rpm, slow can be transferred to 0 rpm, the faster, the smaller the strength!