If you say “external module for Flipper Zero” firs thing. anyone says is NRF24 Arduino module – 2.4GHz module is probably the most known module for Flipper. NRF24 is well documented and it has most apps for Flipper Zero.
Module is easy to connect and as you can see I used seven wires, seven terminals and bit of hot glue to attach NRF24 module to the back of my Flipper Zero. Wiring diagram is easy enough and you an find it in my video above or on picture below. I ordered my NRF24 with RF SMA connector and 2,4GHz antenna.
Thank You and have a look in links bellow for parts or gadgets you need! :