ESC/Receiver,2.4GHz WP, V4: 1/10
V4 ESC/Receiver WILL ONLY WORK WITH V4 TRANSMITTERS
ECX ESC Receiver 2.4GHz WP V4 1 10 ECX13010 is compatible with ECX03028T1, ECX03028T2, ECX03029T1, ECX03029T2, ECX03034, ECX03048IT1, ECX03048IT2, ECX03048T1, ECX03048T2
https://www.horizonhobby.com/pdf/ECX%20Radio%20Conversion%20Guide.pdf