| Operating system version | 4.3 | 
| Weight | 12.4 lbs | 
| Device class | Home & Home Office | 
| PCI Express x4 (Gen 3.x) slots | 2 | 
| Number of screws | 14 | 
| Backup button | Y | 
| Width | 10.4" | 
| Depth | 11" | 
| Height | 7.41" | 
| Type | NAS | 
| Display Type | LCD | 
| Quick installation guide | Y | 
| Supported storage drive interfaces | Serial ATA III | 
| Supported file systems | FAT32, HFS+, NTFS, exFAT, ext3, ext4 | 
| Cable lock slot | Y | 
| Cable lock slot type | Kensington | 
| Number of built-in speakers | 2 | 
| Browser supported | Apple Safari 7, Google Chrome, Microsoft Internet Explorer 10, Mozilla Firefox | 
| HDMI version | 1.4b | 
| Maximum RAM supported | 64 GB | 
| Wake-on-LAN ready | Y | 
| Universal Plug and Play (UPnP) | Y | 
| Access Control List (ACL) | Y | 
| Buzzer | Y | 
| Multilingual support | Y | 
| Online RAID migration | Y | 
| Online RAID expansion | Y | 
| Dynamic DNS (DDNS) | Y | 
| Number of M.2 (M & B) slots | 2 | 
| Fan diameter 2 | 2.36" | 
| Built-in display | Y | 
| Chassis type | Tower | 
| Product color | Gold | 
| Internal memory | 4 GB | 
| Internal memory type | DDR4 | 
| Number of fans | 3 fan(s) | 
| Cooling type | Active | 
| On/off switch | Y | 
| Linux operating systems supported | Y | 
| Built-in speaker(s) | Y | 
| Cables included | AC, LAN (RJ-45) | 
| Fan diameter | Socket AM4, Socket AM5 | 
| Ethernet LAN | Y | 
| Backup function | Y | 
| Backup features | Cloud, iSCSI LUN | 
| Processor frequency | 2.1 GHz | 
| 3.5 mm (1/8-inch) out | Y | 
| Ethernet LAN (RJ-45) ports | 4 | 
| HDMI ports quantity | 2 | 
| USB port | Y | 
| USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity | 4 | 
| Microphone in | Y | 
| AC input frequency | 50 - 60 Hz | 
| AC input voltage | 100 - 240 V | 
| Power supply unit (PSU) capacity | 250 W | 
| Power supply location | Built-in | 
| Ethernet LAN data rates | 10,100,1000 Mbit/s | 
| Wi-Fi | N | 
| Jumbo frames support | Y | 
| DHCP client | Y | 
| iSCSI support | Y | 
| Operating temperature (T-T) | 0 - 40 °C | 
| Operating relative humidity (H-H) | 5 - 95 % | 
| Memory slots | 4 x SO-DIMM DDR4 | 
| Flash memory | 512 MB | 
| RAID support | Y | 
| RAID levels | 0, 1, 5, 6, 10, JBOD | 
| Storage drives installed | N | 
| Installed storage drive type | N | 
| Supported storage drive types | HDD & SSD | 
| Hot-swap drive bays | Y | 
| Number of storage drives supported | 6 | 
| Storage drive sizes supported | 2.5,3.5" | 
| Server operating systems supported | Windows Server 2003, Windows Server 2008 R2, Windows Server 2012, Windows Server 2012 R2, Windows Server 2016 | 
| Operating system installed | QNAP Turbo System | 
| Windows operating systems supported | Windows 10, Windows 7, Windows 8 | 
| Mac operating systems supported | Mac OS X 10.7 Lion, Mac OS X 10.8 Mountain Lion, Mac OS X 10.9 Mavericks | 
| DHCP server | Y | 
| Security algorithms | 256-bit AES, HTTPS, SNMP, SSH, SSL/TLS | 
| Processor family | 2 | 
| Processor model | RX-421BD | 
| Processor cores | 4 |