3. This is an intelligent speed controller, remote control speed and positive and negative rotation can be switched at , the shipment configuration remote control [remote control built-in button batteries] 4.0-999 three-digit digital display scale percentage table, simulation tachometer dual-use Product selling points: 1. Using high quality PCB + ABS shell material, quality is guaranteed, greatly improving the service life of the product 2. On-board knob/switch, 360-degree mechanical feel, speed control /stop one switch 5. The product is soft and soft stop and comes with voltage over-limit protection, current over-limit protection, and more convenient to use!, Manufacturer: Akfldms