Usha Telesystems

http://www.ushatelesystems.com/projectors/

Projectors

http://www.ushatelesystems.com/telephone-instrument/

Telephone Instruments

http://www.ushatelesystems.com/ups-and-inverter/

UPS and Inverter While both UPS and the Inverter provide backup power during mains outage, with the UPS the switch is instantaneous, whereas with the Inverter there is a gap of a second or two. In both the cases AC is converted into DC.