What is difference between M and MP?

For the CDP-TX-07M, CDP-RX-07M 434 and 869 MHz, frequency setting is performed with the 2-bit solder Jumper.
For the CDP-TX-07MP, CDP-RX-07MP 434 and 869 MHz have 2-pin (S1 and S2) connectors for frequency setting, making it possible to set the channels externally. Click here for more details or refer to the application note (434 MHz) and application note (869 MHz).