The UPS must have a brand name. Number of outlets not less than 2, Input voltage 220 V 50 Hz, Output voltage 220 V 50 Hz +/-10%, output power of at least 400 W, Automatic voltage adjustment in the range 165-275 V, User alert: at least alert by means of audible signals in case of switching to battery operation, as well as in case of discharge battery life. 12 V battery, not less than 9Ah, Battery life not less than 5 minutes, Battery charging time not less than 10 hours, Noise level not less than 50 dB. Requirements for the supplier. All supplied equipment must meet or exceed the requirements of this technical specification. The warranty must be with the provision of a letter from the manufacturer indicating the list of service centers that are entitled to warranty repair of equipment