Functions: Adopt high power SCR jako internal system. Thickening metal shell, resistant to high temperatures and durable in use. Get smooth voltage regulation za using the knob. hysteresis, delay, rapid response. The housing is equipped with a universal multifunction socket and a power indicator. Effectively protect the high-power thyristor against surges, surges, absorption of multiple RC protections. Specification: Model: BTA-4000W Input voltage: 220 V AC Plug Type: EU plug Output voltage: 0-220V steplessly adjustable (voltmeter does not work when output voltage is less than 5V) Maximum power: 4000 W (fits do resistive load 2000 W-3000 W) Rated Current: 9A Limit Current: 18 A Package weight: approx. 507g List of packages: 1 x SCR Voltage Regulator 1. Please kindly note if you need a plug adapter. 2. The measured output voltage is a virtual voltage without load. It must be connected do load at least 20W to measure the correct output voltage. 3. The output is AC, not DC. 4. The above 4000W refers to do maximum power when operating under resistive load. The power under the inductive load is 1/3 of the resistive load. Resistive load refers to do tungsten lamp, heating wire, etc. Inductive load refers do serial excitation motor and more. Electronic products with printed circuit board should be used with caution. 5. This product ma metal housing and must be securely grounded.