Please note the modules have ACCESS firmware but can be re flashed to ACCST

FrSky R9M 2019 version upgraded to  take higher external voltage. The R9M module offers 4 switchable RF power outputs to so you can choose the appropriate power for different flight situations. Compared to another FrSky 2.4GHz long range receiver like the L9R, the R9 receiver has a longer operating range up to 10KM and above. Moreover, the R9 is also a redundancy receiver which can connect to another receiver to ensure the security of your aircraft. Supplied with Super8 antenna

• 868MHz working mode
• Long range, low latency and high precision RC system
• 4 Optional RC power
• Smart Port enabled and support telemetry data transmission
• Compatibility              R9
• Operating Voltage      Range 4V-12V

Specification:

• Compatibility: R9 series
• Vin Voltage Range: 6.5V~13V (R9M 2019) / 4V~12.6V
• External Power Supply (R9M 2019): 6.5V~13V
• External Power Supply (R9M): 4V~12V (2s Li-Battery is recommended )
• (*3s Li-Battery is not recommended as external power supply, or it will damage)
• Telemetry Interface: Smart Port
• Upgrade Interface: Smart Port
• Modulations: PXX or CPPM (auto-detected)