The Asus S400CA has an 802.11n wi-Fi standards which is better than most portable PCs of a similar type and age to it. Most laptops of a comparable spec and age to it have an 802.11b wi-Fi standards. In addition, this notebook PC has an 802.11g wi-Fi standards.
This laptop's Wi-Fi standard (802.11n) is actually the best Wi-Fi standard amongst all laptops that have been on the market for around the same time as the S400CA.
An 802.11a wi-Fi standards is the worst Wi-Fi standard amongst comparable types of laptop.