~NEWEST VERSION~ MRT Pro Transponder, works with mylaps RC3.0 RC4.0 through V4.4

MRT mPTX 2 Wire Direct Powered Personal Transponder - MYLAPS RC4 RC3 3

MYLAPS RC4 PRO RC TRANSPONDER

MRT mPTX RC Transponder - Waterproof

MYLAPS PERSONAL RC4 DIRECT POWERED TRANSPONDER

MyLaps 10R147 Mylaps RC4 Pro Direct Powered Personal Transponder (Black)

Trackmate Compatible IR Transponder for RC Cars - works with Trackmate

Vostok lap timing system (vostokelectronics) can read MRT, AMB, RC4 hybrids