Excellent Quality, Materials, Long Service Life, Easy To Install, Fine Workmanship, Durable And Simple To Operate. Powerful Function, High-Speed Motor, Compact, Stable, Reliable In Performance And Easy To Install. Widely Used, Widely Used In Micro- Motors, Widely Used In Hollow Motors Voltage:Between 3v And 4.2v Current:1.9a Rotation Speed:50,000 Rpm Function:720 Hollow Cup, Red And Blue Lines Rotate Forward, Black And White Lines Reverse The Length Of The Hollow Cup Line Is About 12cm Note:Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use Colour: Material:Steel+Plastic Size: Motor Length:About 20mm Motor Diameter:About 7mm Shaft Diameter:About 1mm Shaft Length:About 4.5mm Cord Length:About 12cm Package Contents: 2 * Motor Module Only the above package content, other products are not included. Note: Light reflection 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.