40 + 24 = 64 bit
Standard 64-bit WEP uses a 40-bit key, which is concatenated to a
24-bit initialization vector (IV) to form the RC4 traffic key.

104 + 24 = 128 bit
128-bit WEP protocol using a 104-bit key size which is concatenated to a
24-bit initialization vector (IV) to form the RC4 traffic key.

It supports 64/128 bit WEP

Apply to: LKW-G553, LKW-G651, LKW-G750