QNAP TS-453mini-2G-US Diskless System 4-Bay Quiet and Vertical NAS, Intel 2.0GHz Quad Core CPU with Media Transcoding Form Factor: 4-Bay Port USB: 3 x USB 3.0 port (Front: 1, Rear: 2) 2 x USB 2.0 port (Rear: 2) HDD Interface: Compatible with 4 x SATA 6Gb/s, 3Gb/s 3.5 & 2.5 HDDs & SSDs (with high-speed interface for HDD slot 1 & 2) Processor: Quad-core Intel Celeron 2.0GHz (burst up to 2.41GHz) Default/ Max. Memory: 2GB DDR3L RAM (1 x 2GB) Memory slots: 2 Memory expandable up to: 8GB LEDs: Power, status, LAN, USB, HDD1-4 Port Others: 2 x integrated Gigabit RJ45 Ethernet LAN ports Power: Power Consumption (W) HDD standby: 17.18 W S3 sleep: 1.04 W In operation: 30.23W(with 4 x 1TB HDD installed) Power Supply: 90W AC power adapter, 100-240V