This is an Sanwa/Airtronics RX-371W/92621 3-Channel 2.4G FHSS-2 Waterproof Receiver. The new RX-371W is a small lightweight receiver that is compatible with all Airtronics 2.4G FHSS-2 frequency modulation surface transmitters. This receiver is waterproof and works equally well in cars, trucks and boats, and is a great way to go if you don't need more than three channels. The receiver has a nominal input voltage up to 7.4 volts, so you can power the receiver with a 2S LiPoly battery and use high-voltage servos.
Frequency: 2.4GHz FHSS2
Power supply: 4.8~7.4V
waterproof !!! bind vitch sanwa mx sport (lrp c3y)Pretty basic and expensive but it is waterproof so it makes it ideal for boats. This isn't a fault in the receiver but waterproof does not make glitch proof: if you are a boater, and sail in salt water you still need to protect the plug area, otherwise water can collect in the plug well if you take water on board and can short out the ESC or servosWorks with Sanwa Gemini X no probs, Just need to put TX in FH2 mode. Just wish They'd stock it at the UK warehouse. Good price too.100pcnt original and the cheapest you can find. Works well with my MT4, just had to change the modulation in the transmitter - see manual.manual says 6.0v max hobbyking say 2s lipo, after contacting hk they say 2s fine not tried tho.