Feature 1Adopt high power SCR as the internal chip. 2Thickening metal shell, high temperature resistant and durable in use. 3Achieve stepless voltage adjustment by knob. 4Zero hysteresis, zero delay, fast response. 5The shell is equipped with a universal multi-purpose socket and a power indicator.Specification Features: Adopt high power SCR ;as the internal chip. Thickening metal shell, high temperature resistant and durable in use. Achieve stepless voltage adjustment by knob. Zero hysteresis, zero delay, fast response. The shell is equipped with a universal multi-purpose socket and a power indicator. Effectively protect high-power thyristor against surge, anti-spike, RC absorption of multiple protection. Specification: Model: BTA-4000W Input voltage: AC220V Plug type: EU plug Output voltage: 0-220V stepless adjustable (the voltmeter does not work when output voltage is lower than 5V) Maximum power: 4000W (fit for 2000W-3000W resistive load) Rated current: 9A Limit current: 18A Package weight: Approx. 507g ; Package List: 1 x SCR Voltage Regulator Note: 1. Please kindly make a note if you need any plug adapter. 2. The measured output voltage is a virtual voltage when no load. It must be connected to a load of 20W or more to measure the correct output voltage. 3. The output is AC, not DC. 4. The above mentioned 4000W refers to the maximum power when working under resistive load. The power under inductive load is 1/3 of the resistive load. The resistive load refers to tungsten lamp, heating wire, etc. The inductive load refers to the series excitation motor and more. The electronic products with circuit board should be used with caution. 5. This product has a metal shell and must be grounded safely.