Material: plastic + metal Size: about 3.1 x 3 cm/ 1.2 x 1.1 inches Voltage range: 1.8V-12V Board size: . 3.2 x 3.2 cm/ 1.2 x 1.2 inch Max. Current: 2A Note: This item, the electrical machine can not afford the continuous current more than 0.5 A, such as 755 electric machines and children's carobile. The motor speed controller is equipped with a self recovery fuse 2A and a power-on LED light. It can easily have a continuous current of 2A to your DC motor or other DC load. With the recovery backup ( automatically disconnect the automatic recovery after cooling, when the current becomes too large.) Delivery: 4 x motor speed controller 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.