Philips HH1471/00, 50 - 60 Hz, A-Flex, C-Flex, C-Flex+, 4 mmH2O, 20 mmH2O, APAP, CPAP, MicroSD (TransFlash) Philips HH1471/00. AC input frequency: 50 - 60 Hz, Flex modes: A-Flex, C-Flex, C-Flex+, Minimum air pressure: 4 mmH2O. AC input voltage: 100 - 240 V. Width: 5.91" (150 mm), Depth: 5.91" (150 mm), Height: 2.28" (58 mm)