TP-Link TL-WR740N User Manual page 47

Disable Security - If you do not want to use wireless security, select this check box, but it's
strongly recommended to choose one of the following modes to enable security.
WEP - It is based on the IEEE 802.11 standard. If you select this check box, you will find a
notice in red as show in Figure 4-17 .
TL-WR740N/TL-WR741ND
Figure 4-16
Figure 4-17
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150Mbps Wireless N Router