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The 900MHz R9 MM-OTA receiver implements the ACCESS protocol and brings the user improved performance and features. The R9 MM-OTA supports wireless firmware updates over the air making binding to receivers even easier. As well as the convenience of checking the current receiver firmware version. The R9 MM’s compact form factor design is also carried over to the OTA version, and the R9 MM-OTA supports inverted S.Port as well.This receiver works compatible with the new release R9M Lite Pro module,and the other 900MHz modules will also be supported when the ACCESS firmware is available.SPECIFICATIONSDimension: 16*10*2.8mm (L×W×H)Weight: 0.7g (without antenna)Number of Channels:Non-LBT Version: 4/16CH (Telemetry)LBT Version: 4/16CH (Telemetry) / 4/16CH (No Telemetry)Operating Voltage Range: DC 3.5V – 10VOperating Current: 100mA@5VOperating Range: Up to 10km or aboveCompatibility: R9 series 900MHz module (ACCESS protocol)FEATURES915MHz (Non-LBT Version)/ 868MHz (LBT Version)Mini size and super lightweightSupports OTA firmware updateSupports firmware version checkS.Port enabled and support telemetry data transmission(Support F.Port, download firmware to support the function)Inverted S.Port enabledLow latency and high precisionWith RSSI output in SBUSBattery voltage detection supportedDetachable Ipex connector antenna