Best of system (B.O.S) is a global company, which specializes in designing and manufacturing the power supply, and the high reliability of our products result from the most advanced technique of the aerospace and the military. We always take the technology of inverter as the core, the products include Inverting Power Supply (widely used electric power, communication, Locomotive), Variable Frequency Power Supply, Aviation Military Special-purpose Power Supply (400Hz frequency conversion, 28.5 Direct-current power supply), Uninterruptible Power Supply (UPS), Emergency Power Supply (EPS) and new energy power supply (solar energy and wind power system) etc.