Unit is in excellent condition, just the unit alone, does not come with wiring or relays. The NOS Time-Based Progressive Nitrous Control starts nitrous flow at any level you set (from 0% to 100%) and then gradually brings in the full 100% flow of nitrous over a time period adjustable from 0 to 10 seconds. This allows you to start with a small shot of nitrous power (say 25 to 30%) to minimize wheel spin off the line; then smoothly transition to full nitrous power when the tires can hook up and handle it.

Unit retails for $400 new, asking $160 shipped.