[MJX HYPER GO H10G 1/10 4WD Off-road All Rock RC Crawler]
The waterproofing is genuine, but on the MJX Hyper Go H10G RC Car "waterproof" doesn't mean "submersible", because the receiver bay seal decides everything.

Stock Configuration
The R80 is an 8-channel receiver, included with both the standard and DC versions.
Real-World Performance
Protection comes from potting or conformal coating on the board, which handles splashes and short water crossings fine. The bay cover gasket is the first line of defense, though. If the cover isn't latched tight or the gasket has aged, water gets in there and the receiver's rating won't save it.
Maintenance and Upgrades
Open the receiver bay after every water run, even a splash. Dry out any moisture before powering up, because long-term damp causes pin oxidation that's more insidious than a direct soak.
FAQ
Q: Can I replace a dead receiver with another brand?
A: Yes, but you may not use all 8 channels, and the stock transmitter's binding protocol isn't public.
Conclusion
R80 waterproofing handles normal off-road use, and on the MJX Hyper Go H10G RC Car the maintenance key is the bay seal rather than the receiver itself.
