Activated remotely by twin in/out buttons, the Rewind Radial lets you safely ease and trim highly loaded sails in both directions without ever taking the line out of the self-tailer, a patented feature. Like all electric Radials, the Rewind operates like a normal Harken two-speed electric winch. A simple flip of the red knob on the winch base turns on the rewind feature. A spring-loaded arm of investment-cast stainless steel funnels and keeps line captive as it feeds in and out of the self-tailer while you adjust the sail under fingertip control. Each electric winch requires one control box, one circuit breaker, and two analog switches or one Digital System Switch. All new electric Radial and Performa electric winches are supplied with the appropriate dual-function control box. For replacement or retrofit control boxes, contact Harken.