This is a Kustom Signals controller unit designed for use with radar speed trailer signs. The item is listed in 'for parts or not working' condition, making it suitable for technicians, municipalities, or individuals seeking components for repair or refurbishment projects. Free shipping is included with the purchase. As a specific electronic controller, its primary function is to manage the operation of a speed display trailer. Potential buyers should have the technical expertise to diagnose and integrate this part. Since the unit is sold as-is for parts, please review the listing thoroughly for any additional details or specific symptoms before purchasing. Kustom Signals Controller For Radar Speed Control Trailer. Condition: For parts or not working. Listed at 550.00 USD. Kustom Signals Controller From Radar Speed Control Trailer This was removed from a 2006 Kustom Signals radar speed control trailer. It did power up before it was removed from the trailer but It is being sold AS-IS, FOR PARTS as I have no way to properly test it. This sale only includes what you see in the photos. Please see photos for details and ask any questions prior to purchase.