The RC4 Pro Transponder, specially designed to take any RC Racer to the next level. The MYLAPS transponder is used in all vehicles on the track to identify the racer and record their results. MYLAPS Speedhive is the platform where RC racers can get more insights in their race performance. With the Speedhive app and web services you can track races, find your practice results, compare results and share your progress with friends. All vehicles on the track are equipped with MYLAPS transponders to identify the racer and record their results. Every RC vehicle has an RC transponder installed, that sends out a unique signal to the detection loop in the track. The MYLAPS transponder has been the gold standard in RC racing for many years. The RC4 Pro Transponder takes the Racer to the next level. Source: https://www.mylaps.com/rc4-timing-system/rc4-pro-transponder/