QNAP TS-439 PRO. Total storage capacity: 0 GB, Hard drive capacity: 0 GB, Hard drive interface: Serial ATA II. Memory type: DDRII RAM, Internal memory: 1024 MB, Flash memory: 128 MB. Processor model: Intel Atom, Processor clock speed: 1600 MHz. Power requirements: 100 - 240 V AC, 50 - 60 Hz, Power supply: 250 W. Weight: 3650 g