The Lenovo E545 has a better Wi-Fi standard than most similar spec laptops that have been available for around the same time as it. This Lenovo notebook PC has an 802.11n WiFi standard, whereas most laptops that have been around for around the same time as it have an 802.11b WiFi standard. In addition, this notebook PC has an 802.11g WiFi standard.
An 802.11n WiFi standard is actually the best Wi-Fi standard across all notebook PCs that have been on the market for more than two years.
An 802.11a WiFi standard is the worst Wi-Fi standard amongst similar types of notebook PC.