315M or 413M accept ordinary wireless sending module for sending and receiving procedures. That is, the cheapest kind of communication module.

receiver
receiver.c
receiver.hex
receiver.lnp
receiver.LST
receiver.M51
receiver.OBJ
receiver.Opt
receiver.plg
receiver.Uv2
receiver_Opt.Bak
receiver_Uv2.Bak
send
send.c
send.hex
send.LST
send.M51
send.OBJ
send.Opt
send.plg
send.Uv2
send_Opt.Bak
send_Uv2.Bak

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Nothing．