This is a Sanwa/Airtronics M17 RX-491 2.4GHz 4-Channel FHSS5 SSL Telemetry Receiver.
Features:
Compact receiver
Plug in Bind
Short Antenna
2.4 GHz FHSS5 Spread Spectrum System 4ch
Compatible with Telemetry (RPM and Temperature measuring only with the SUPER VORTEX Series)
Compatible with SSL (SUPER VORTEX Series)
Ultra Response Mode (SUR)
Waterproof
The smallest and most light receiver in the class
Note: This receiver is only compatible with the M17 Radio System.
Specifications: