Product Description Related Products Total Price: Add to Cart Please choose options for all selected products This Item: Ritron RPS-EXPO External Power Supply MSRP: $29.95 (You save ) Product Description Ritron RPS-EXPO External Power Supply Power Supply for Ritron 110 VAC, 13 VDC UL Listed. Fits Ritron Outpost 1 Series, RQX, XT Callboxes, Quick Talk,