SnowEx STX-500 Salt-Traxx for V-Maxx SpreadersSnowEx STX 500 Salt Traxx for V Maxx Spreaders SnowEx's Salt Traxx is an innovative tracking device Features: Compatible with SP 8500, SP 8550, SP 2200, SP 2400, SP 9300, SP 9500 spreaders Plugs into the spreader's existing controller and records useful job site data, such as time spent and amount of salt used This information is saved to a standard removable USB memory stick and can be uploaded to a personal computer in a format compatible with