Product details of Gear Motor for Robot Wheel DC(2pcs) Operating voltage:3V ~ 6V DC (recommended value 5V) Maximum torque:800g.cm Speed without load:90±10rpm Reduction ratio:1:48 No Load current:190mA(max.250mA) Stall Current:~1A Operating voltage:3V ~ 6V DC (recommended value 5V) Maximum torque:800g.cm Speed without load:90±10rpm Reduction ratio:1:48 No Load current:190mA(max.250mA) Stall Current:~1A Strong anti-interference on this motor keeps it safe around micro-controllers. Shaft Size: 8mm x 5.4mm diameter Weight: 17g