https://www.qnap.com/en/product/tl-r1200s-rp TL-R1200S-RP Drive Bay 12 x 3.5-inch SATA 6Gb/s, 3Gb/s Drive Compatibility 3.5-inch SATA hard disk drives 2.5-inch SATA solid state drives Audio Alert On/Off Switch Form Factor 2U Rackmount Host Interface 3 x SFF-8088 LED Indicators HDD 1-12, Status, Link, Fan error Buttons Power switch Dimensions (HxWxD) 88.6 × 482 × 562.5 mm Excludes ear hook and the protruding part of the Power Supply Unit. Weight (Net) 9.49 kg Weight (Gross) 12.77 kg Max. number of HDDs/SSDs supported 12 Hard Drive Type 3.5-inch SATA hard disk drives 2.5-inch SATA hard disk drives 2.5-inch SATA solid state drives Operating Temperature 0 - 40 °C (32°F - 104°F) Storage Temperature -20 - 70°C (-4°F - 158°F) Relative Humidity 5-95% RH non-condensing, wet bulb: 27°C (80.6°F) Power Supply Unit 250W(x2) PSU, 100 - 240V Power Consumption: Operating Mode, Typical 73.7 W Tested fully populated with Seagate ST6000NM0024 hard drives. Fan Mode Switch (Auto, high, medium, low) Fan 2 x 70mm, 12VDC System Warning Buzzer