Features:Speed Control Knob: This knob can adjust motor speed, easy to use. Clear operation panel and dial, the pointer can point speed accurately. When the load is fan or pump, the power saving effect is remarkable. With IP5X dustproof class, can be used for panel embedded or wall mounted, bottom incoming wire. Used for speed control of electromagnetic asynchronous motor (slip motor), realizing stepless adjustment of constant torsion. Specification: Model Number: Motor speed controller Motor Type: AC Motor Condition: Input Speed: 1rpm Output Speed Range: 1 Exciting Voltage: DC90V Field Current: 5A Mounting-hole Size: . 192 x 132mm / 7.6 x 5.2inch Product Size: . 210 x 150mm / 8.3 x 5.9inch Weight: . 944g / 33.3oz Model: JD1A-40 Speed Adjustable Range: 132-1320RPM Control Motor Power: 15-40kW Input Voltage: AC 200-240V Features 1: Motor Speed Control Features 2: Motor Controller Features 3: Adjustable Motor Speed Controller Features 4: AC Motor Speed Controller Color: white + black Material: plastic + metal + copper Package Contents: 1 * motor 1 * set of accessories Only the above package content, other products are not included. Note: Light 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.