Smooth operation and low noise Super and sustainable life 10, 000 hours of operation Working temperature: Greater than60°C Limit temperature: 80°C Due to different batches, the appearance, color and printed words of the product , which not affect the use. Material: Metal colour: Black Package Contents: 1 x Stepper Motor 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.