The DELL Latitude 12 E7240 has a better Wi-Fi standard than most similar spec portable PCs that came out more than two years ago. This laptop has an 802.11n wi-Fi standards, whereas most comparable spec laptops that are a similar age to it have an 802.11g wi-Fi standards. In addition, this notebook PC has an 802.11b wi-Fi standards.
This laptop's Wi-Fi standard (802.11n) is in fact the best Wi-Fi standard amongst all portable PCs that have been on the market for around the same time as the Latitude 12 E7240.
The worst Wi-Fi standard across similar types of laptop is 802.11a.