EFFICIENT HEAT DISSIPATION: This motor speed controller with heat dissipation hole design, the machine has slight heat when working, and the efficient heat dissipation of heat dissipation hole makes the machine performance more stable. br SAFE AND RELIABLE: The input and output are connected with large current terminals, which is safer with a safety cover. SIMPLE to USE: Voltage can be adjusted freely, stepless speed regulation, increase from 0V to 220V or from 220V to 0V, simple operation. DURABLE AND ROBUST: Using flame retardant metal case, high temperature flame retardant, no deformation, no rust, safe and durable. CONVENIENT to USE: The installation hole design, flat, easy to hang, and humanized design are more practical. Feature: 2. The input and output are connected with large current terminals, which is safer with a safety cover. 3. The voltage can be adjusted freely, stepless speed regulation, increase from 0V to 220V, or from 220V to 0V, simple operation. 4. The installation hole design, flat, easy to hang, and humanized design are more practical. 5. With the heat dissipation hole design, the machine has a slight heat when working, and the efficient heat dissipation of the heat dissipation hole makes the machine performance more stable. Specification: Item type: engine speed controller Product model: DRDY4000 Input voltage: AC220V Output voltage: AC0-AC220V Input frequency: 47Hz-63Hz Output frequency: 47Hz-63Hz Rated output current: 25A Rated output power: motor less than 1000W, heating wire less than 2000W, electric oven Size: approx. 75 mm / 3 inches 60 mm / 2.4 inches 130 mm / 5.1 inches 95 mm / 3.7 inches Mounting holes: approx. 85 x 95mm / 3.3 x 3.7inch Diameter: approx. 4 mm / 0.2 inches List of packages: