MRT Transponder, Works with mylaps RC3 RC4 Through V4.4 System for RC car Racing.

Works great at both my outdoor track and local indoor clay racing track. Obviously you want to check with your track owners to assure compatibility with whatever lap tracking system and version they are using. But this seems to cover the most versions and main stream option for most tracks. No issues in my 5 race days.

Works perfectly at our track

Excellent product

This is the second one of these transponders I have bought and have never had an issue in either one of my cars.

Once we got the adapter it worked perfectly, no noise from the product, best value of anywhere

Works great

Worked perfectly

Tried multiple connections. Transponder works until you move.