Ricoh PJ WU6181N 6200-Lumen WUXGA LCD Projector (No Lens) - Manual (Page 157)

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5. Using On-Screen Menu
When [WPA-PSK], [WPA-EAP], [WPA2-PSK], or [WPA2-EAP] is selected for [SECURITY TYPE]
ENCRYPTION TYPE Select [TKIP] or [AES].
KEY Enter encryption key. Key length must be 8 or greater and 63 or less.