UPS power supply brands have what

There are many UPS power supply brands, the market is more recognized by users have Crestec, Emerson, Schneider and so on. Crestec is a national brand, more than 20 years old, the quality and price of the product is good, Emerson and Schneider is a foreign brand, sales in China is also very good. These brands are China's UPS power supply of the first echelon of enterprises.