| Ordering P/N | TS-251A-4G |
| Processor | 14nm Intel® Celeron® N3060 dual-core 1.6GHz (up to 2.48GHz) |
| Hardware Encryption Accleration | ✓，AES-NI |
| System Memory | 4GB DDR3L (2 x 2GB) |
| Maximum Memory | 8GB |
| Memory Slot | 2 x SODIMM DDR3L (For dual-DIMM configurations, you must use a pair of identical DDR3L modules.) |
| Flash Memory | 4GB, pre-loaded with QTS system |
| Drive Type | 2 x 3.5″/2.5″ SATA 6Gb/s HDDs/SSDs |
| GbE LAN | 2 x Gigabit RJ45 LAN port |
| USB Port | 3 x USB 3.0 ports (Front: 1, Rear:2) |
| SD Card Reader | ✓ |
| USB QuickAccess | ✓ (USB 3.0 Micro-B); USB cable is not included |
| HDMI | 1, max. resolution 3840 x 2160 @ 30Hz |
| Audio Input | 3.5mm Microphone Input jack (for dynamic microphone) |
| Audio Output | 3.5mm Line Out jack (for ampliers or speakers) |
| LED Indicator | Status/Power, USB, HDD 1, HDD 2 |
| Button | Power/Status, USB one-touch-backup, reset |
| IR Receiver | ✓, supports QNAP RM-IR002 and MCE-compliant remote controls |
| Others | Kensington security slot，system maintenance port |
| Dimension | 169 x 102 x 219 mm 6.65 x 4.02 x 8.62 inch (HxWxD) |
| Weight | Net: 1.28 kg (2.82 lbs) Gross: 2.64 kg (5.82 lbs) |
| Operating Temperature | 0-40˚C |
| Relative Humidity | 5~95% RH non-condensing, wet bulb: 27˚C |
| Noise Level | 18.3 dB (A) Refer to ISO 7779 ; Maximum HDD loaded ; Bystander Position ; Average data from 1 meter in front of operating NAS |
| Power Consumption | System sleep: 0.72W HDD standby：7.9W In operation：16.2W (with 2 x 2TB HDDs) |
| Power | 65W AC power adapter, 100-240V AC |
| Fan | 1 x 7cm system fan (12V DC) |
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