Microtek EM 4170+ - 170 to 280 V Digital AC Voltage Stabilizer - It is made up of metallic grey colour. It has intelli micro-chip based design with intelli auto start option. It has silicon-based transistors with the silver caked relay. Intelli thermal management system makes it suitable for AC’s up to 1.5 tons. It is known for high performance and better reliability during frequent power cuts and voltage fluctuations.