| Specifications | R251D and R251D-E |
| Dimensions (H x W x D) | 32.5 mm x 86 mm x 150 mm |
| Power Input | PoE power supply: In compliance with IEEE 802.3af/at |
| Interface Types | Uplink: 1 x GE Downlink: 4 x GE 2 x Pass-through RJ45 port 1 x USB port (supported by the R251D-E) |
| Built-in Bluetooth | BLE4.1 (supported by the R251D-E) |
| PoE OUT | Supported by R251D-E: Maximum 13.6W (802.3at-compliant, supported only by GE4) |
| Operating Temperature | 0°C to 40°C |
| Antenna Type | Built-in smart antennas |
| Maximum Number of Users | ≤ 256 |
| Maximum Power Consumption | R251D: 11.5W R251D-E: 11.5W (excluding the output power of the USB port and PoE_OUT port) Note: The actual maximum power consumption depends on local laws and regulations. |
| Maximum Transmit Power | 2.4 GHz: 23 dBm (combined power) 5 GHz: 23 dBm (combined power) Note: The actual transmit power depends on local laws and regulations |
| MIMO: Spatial Streams | 2 x 2:2 |
| Radio Protocols | 802.11a/b/g/n/ac/ac Wave 2 |
| Maximum Rate | 1.267 Gbit/s |
