The Eco Pack is the replacement pack for all Arctic Spas and all model years. Everything is hardwired so it may take a little bit of time to connect up an older spa. This pack originally came out in 2011. It also offers the ability to add wifi and Bluetooth. This means that you can wirelessly connect via your iPhone, iPod Touch, or iPad for complete control of your spa. The Bluetooth option allows wireless streaming of music/sound to the spa stereo.