COMPATIBLE WITH TST 507 SYSTEMS – Easily add four cap sensors to your TST system to monitor tire pressure and temperature. LOW-PROFILE SENSOR CAPS – Great for towed vehicles and car wheels as these caps are low profile and work with any valve stem. EASY TO INSTALL AND USE – Simply pair with your TST 507 monitor and then screw onto the tires you want to monitor. Find issues quickly because each sensor displays uniqely on the TST monitor (not included). The system allows you to customize each axle for high and low alert parameters, i. Tire pressure and temperature. Set a custom parameter for each tire on your vehicle and towable. MULTI-VEHICLE MONITORING SYSTEM – TST 507 systems accommodate all sizes of tow vehicles, 5th wheels, RVs, motor homes, boat trailers, agricultural trailers, construction trailers, motor homes, construction equipment, and commercial transport vehicles. Monitor up to 110 tires: 14 in the power position, four trailers at 24 tires each.