some places you race will need you to have a ptx transponder
this is put in the car to time your laps
some clubs will have transponders you can use but they are bulky
have a look for a second hand AMB PTX or MRT PTX
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LOSI 22 - SPEED PASSION 6.5 - ORCA VRITARA PRO - SAVOX - Spektrum DX3R 
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