Have to supply me previously the Trust and a Weoco inverters ordered around my 32 "TV with power. Both were not optimal. This device is optimal. It has built no fan in the device and is Deshalt extremely quiet, or quietly. The TV consumes 50 Watt and the inverter is almost not warm. He also produces a pure sine wave voltage and therefore no hum of the power supplies in the TV or in the switching power supply of my notebook when connected thereto. Thus, a device has to work !!!