Avs30 heavy duty voltage prtector, work voltage range 0_380v, frequency 50hz&60hz, voltage display 0_300v, normal work temperature 0_80v, delay time 15sec(green lamp/3ins red lamp), under voltage protector 165v_195v adjustable, over voltage protector 200v_265v adjustable,: protects against high and low voltage,brown-outs, power back surges and voltage dips. these conditions are exremely harmfui and damaging to electrical and electronic equipment by disconnecting the power when it's bad and recnnecting automatically on return of normal power, the avs60 appliance guard safeguard and protects against short term and long term damage ensure longevity of your appliance. reconnection takes place after a start_up delay to protect against freguent fluctuations.