Check the listing for details. PDL-10A Colby Instruments Programmable Delay Line. Condition: Used. Listed at 399.95 USD. This is a PDL-10A Colby Instruments Programmable Delay Line This Delay line makes a sound every time it turns on, nothing that seems to affect functionality --Specs Delay Range From 0 to 625 PSBandwidth From DC to 18 GhzFully Programmable GPIB Interface Total Parts will guarantee you're totally happy with your purchase! 14 Day Return Policy if merchandise is in unused condition.We promise to ship your merchandise fast!We promise to send you tracking information immediately when shipped!We promise to respond to your questions and concerns!If you have any questions, concerns or suggestions please contact us through the eBay messaging system.Please take a moment to see our current specials on eBay our other eBay listings. Powered by SixBit's eCommerce Solution