This angle grinder speed controller is a versatile electronic voltage regulator and speed controller with multi-function, safety, and convenience. With stepless speed regulation function, it can not only be used for angle grinders, marble machines, exhaust fans, electric heaters, and other power tools and home appliances for speed regulation, but also can be applied to the resistance of electric heaters, motor fans and other devices for voltage and power regulation, and even adjust the brightness, temperature and other parameters, its application is extremely wide. With its strong functional compatibility, safety protecting mechanism, precise voltage regulation capability, and humanized design, it has become a very cost-effective and practical speed controller product. Features: Multi-functional Stepless Speed Control: With stepless speed regulation function, it can not only be used for angle grinders, marble machines, exhaust fans, electric heaters, and other power tools and home appliances for speed regulation, but also can be applied to the resistance of electric heaters, motor fans and other devices for voltage and power regulation, and even adjust the brightness, temperature and other parameters, its application is extremely wide. Safety Protecting Design: Adopts the ABS flameretardant housing which provides high-temperature resistance, compression resistance, and high insulation properties, to ensure the safety of the use process. With overload and short circuit protections, built-in overload and independent switch to control the input and output voltage, to replace the boat switch and fuse, effectively prevents equipment damage caused by overload or short circuit. Precise Voltage Regulation & Voltage Display: Equipped with a highly precise potentiometer regulator system, which ensures the high accuracy and stability of voltage regulation; at the same time, equipped with a high-precise voltmeter, which displays the output voltage in real-time, so that the user can accurately grasp the working status of the equipment. 4000W High Power & Regulation Knob: 4000W high power design can meet the use of various types of high power devices, while using a precise potentiometer regulator, through a turn of the regulator to achieve easy speed regulation, energy saving and power saving, simple and practical operation. Humanized Details: Compact model, easy to carry, specially designed with a hookbuckle, which makes it easy to use an angle grinder when the operator hangs the toolkit or tool belt to improve efficiency, reflecting the humanized care. Warm tips: Products inside the circuit board and capacitive electronic elements can not be used, bedside clip fans, miniature fans, small ceiling fans, LED energy-saving lamps, microwave ovens, induction cookers, microwave ovens, washing machines, rice cookers, aquarium pumps, brushless synchronous motors and so on. Specifications: Name: Electronic Voltage Regulator Material: ABS Maximum power: 4000W (load power 2000W) Maximum current: 10A, 15A (optional) Item size: 120 * 65 * 55mm / 4.72 * 2.56 * 2.17in Package size: 145 * 120 * 115mm / 5.71 * 4.72 * 4.53in Package weight: 420g / 0.93lb Packing List: 1 * Electronic Voltage Regulator