QNAP TS-419P Turbo NAS 4TB. Total storage capacity: 4000 GB, Hard drive capacity: 1000 GB, Hard drive interface: Serial ATA II. Memory type: DDRII RAM, Internal memory: 512 MB, Flash memory: 16 MB. Processor model: Marvell 6281, Processor clock speed: 1200 MHz. Weight: 3 kg. Operating relative humidity range: 0 - 95 %, Operating temperature range (T-T): 0 - 40 °C