From their product description here:
http://www.bectechnologies.net/files/7402Series_DS.pdf
Quote:
Wi-Fi 802.11g (7402GTM only)
• Compliant with IEEE 802.11g and 802.11b standards
• 2.4 GHz – 2.484G Hz frequency range
• Up to 54 Mbps wireless operation rate
• 64/128 bits WEP supported for encryption
• WPA/WPA2 support
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Sounds like it supports WEP to me.