The Long Range Receiver FrSky R9 Slim+ (NON-OTA ver.) is the updated version of R9 Slim, with optimized performance and 2 detachable antennas. The Long Range Receiver R9 Slim+ has all the features of the R9 Slim with the flexibility to work with more external devices by incorporating the inverted SBUS and S.Port outputs.

Long Range Receiver R9 Slim+ SPECIFICATION

Dimension: 32*13.5*5mm (L × W × H)
Weight: 4.3g (with antennas)
Number of Channels:
Non-EU Version: 6/16CH (Telemetry)
EU Version: 6/8CH (Telemetry) / 6/16CH (Telemetry) / 6/16CH (No Telemetry)
With RSSI Output: Analog 0~3.3V
Operating Voltage Range: DC 3.5V~12.6V(3s Li-Battery)
Operating Current: 100mA@5V
Operating Range: Up to 10km or above
Firmware Upgradable
Compatibility: R9M and R9M Lite

Long Range Receiver R9 Slim+ FEATURE

915MHz (Non-EU Version)/ 868MHz(EU Version)
Performance optimized
2 detachable ipex connector antennas
Small and conveniently setup
Low latency and high precision
Support redundancy function
Smart Port enabled and support telemetry data transmission
Battery voltage detection
With RSSI output
With inverted SBUS and S.Port outputs

From: https://www.horusrc.com/en/frsky-r9m-2019-module-and-r9-slim-non-ota-ver-receiver-with-mounted-super-8-and-t-antenna.html