| Connectivity technology | Wireless |
| Host interface | USB |
| Interface | WLAN |
| USB version | 2.0 |
| Maximum data transfer rate | 150 Mbit/s |
| Networking standards | IEEE 802.11b, IEEE 802.11g, IEEE 802.11n |
| Wi-Fi | Yes |
| Top Wi-Fi standard | Wi-Fi 4 (802.11n) |
| Wi-Fi standards | 802.11b, 802.11g, Wi-Fi 4 (802.11n) |
| WLAN data transfer rates supported | 150 Mbit/s |
| Security algorithms | 64-bit WEP, 128-bit WEP, 152-bit WEP, WPA2-PSK |
| Bandwidth | 2.4 GHz |
| Bandwidth (first) | 2.4 GHz |
| Internal | No |
| Component for | IP Phone |
| Product colour | Black |
| Operating temperature (T-T) | 0 - 50 °C |
| Storage temperature (T-T) | -40 - 85 °C |
| Width | 18 mm |
| Depth | 26.9 mm |
| Height | 8 mm |
| Harmonized System (HS) code | 85176990 |
| Description |
| Yealink WF40. Connectivity technology: Wireless, Host interface: USB, Interface: WLAN. Maximum data transfer rate: 150 Mbit/s, Top Wi-Fi standard: Wi-Fi 4 (802.11n). Product colour: Black |