Edimax EW-7303APn v2 Quick Installation Manual page 34

If you set Security Mode to "OPEN-WEP or SHARED-WEP`", please fill in the
related configurations at below.
Item Description
Default Key Specify a Key number for effective.
WEP Keys (1~4) When you select WEPAUTO, please input 5, 13 (ASCII), 10 or 26 (HEX)
characters for WEP Key.