Whelen 28V Strobe Light Power Supply P/N HS-28 (Core) from $55.55 Qty. Add to Cart This item is a recurring or deferred purchase. By continuing, I agree to the cancellation policy and authorize you to charge my payment method at the prices, frequency and dates listed on this page until my order is fulfilled or I cancel, if permitted. Condition: For parts or not workingCondition Description: core - unit whines but does not flash Manufacturer Part Number: HS-28 Qty available: 1 Tweet