Features:_x000D_ _x000D_ This item has new two-way large power silicon controlled rectifier and the current can be up to 40A, which is a good solution to over-current of electric stove wire caused by low resistance during cooling. _x000D_ It can easily adjust the output voltage on a scale of 0-100% (nonlinear) to power electric device. _x000D_ Designed with large and thick heat sink that would enhance heat dissipation. _x000D_ This voltage regulator is adjusted with button which is much more stable than potentiometer. _x000D_ Voltage regulator has wave voltage absorbing circuit and effective protects large power silicon controlled rectifier, longer service life and more durable. _x000D_ It can be used as power supply for large electrical devices, enough for household appliances or for small factory. _x000D_ Could be widely used as heat controller on electric stoves, water heaters, light dimmer on lamps, speed controller on small motors, or temperature controller on electric soldering iron, etc. _x000D_ _x000D_ Specification:_x000D_ Voltage: AC 220V_x000D_ Max Power: 4000W (instantaneous limit power for resistive load; for long time use, 2000W or lower is recommended)_x000D_ Voltage Adjustment: 0-100% (nonlinear)_x000D_ _x000D_ Panel Size: 7.5*6*2cm / 3*2.4*0.8in _x000D_ Voltage Controller Size: 8.5*6*4cm / 3.3*2.4*1.6in _x000D_ Weight: 152g / 5.4oz (approx.)_x000D_ _x000D_ Package list:_x000D_ 1 * Voltage Controller_x000D_ _x000D_ 1 * ABS Panel _x000D_ 1 * Panel Sticker_x000D_ _x000D_ 1 * Cable_x000D_ _x000D_ Note: _x000D_ It can not replace electric bicycles' battery charger, nor drive electric appliances which use switch power supply (such as 110V TV, speaker, refrigerator, air conditioner, rice cooker with a computer), and cannot drive induction cooker, energy saving lamp._x000D_ _x000D_ Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. 1This item has new two-way large power silicon controlled rectifier and the current can be up to 40A, which is a good solution to over-current of electric stove wire caused by low resistance during cooling. 2It can easily adjust the output voltage on a scale of 0-100% (nonlinear) to power electric device. 3Designed with large and thick heat sink that would enhance heat dissipation. 4This voltage regulator is adjusted with button which is much more stable than potentiometer. 5Voltage regulator has wave voltage absorbing circuit and effective protects large power silicon controlled rectifier, longer service life and more durable.