The Voltage Optimiser is ideal for homes where the grid voltage is too high.It adjusts the incoming power supply by reducing the voltage supplied to the optimum level, by a choice of either 6V, 12V or 18V. This helps to prolong the life of sensitive devices such as TVs, laptops, and anything else with a circuit board. · · · 230V+ 10% – 6%, 50Hz Nominal Input Voltage · · Built in Voltage Protection · · Digital Display · · Prevents Electrical Wear