The TST Signal Repeater will ensure the signal from the sensors to the monitor is always strong. This repeater works for the 507 TPMS systems. With the signal repeater installed, the TST 507 display monitor can read sensor signals up to 105 feet away from the monitor. It is easy to install and is powered by any 12-24V power source. If you are having signal issues from the TST sensors to the monitor, then this repeater will clear this up.