300 Motor parameter: Voltage range: 1.5V~9V; Rated voltage: 3.0V; Unloaded speed: 2600rmp; Unloaded current: 0.03A; Max. speed: 1730rmp; Max. current: 0.07A; Max. moment: 0.39mN.m; Max. torque: 4.0g.m; Max. power: 0.07W; starting moment: 0.98mN.m; starting torque: 10g.cm; Startibg current: 0.17A. - 130 Motor parameter: Voltage range: 1V~6V; Rated voltage: 3V; Reference current: 0.35~0.4A; 3V Speed: 17000－18000rmp; 3V no-load current: 350A; 3V wall mount current: 1.3A; Shaft diameter: 2mm; Shaft length: 9mm; Weight: 14.24g. - N20 Motor parameter: Voltage range: 1.5V~4.5V; Rated voltage: 3V; 3V Speed: 3000－6000rmp; 3V current: 0.021A; Shaft diameter: 1mm; Shaft length: 10mm. - 716 Hollow cup parameter: Voltage range: 3.3V~5V; Rated voltage: 3.4V; Current: 800mA; Rated speed: 34000rmp; Max. speed: 50000rmp; Shaft diameter: 0.8mm; Shaft length: 7mm.