Sanwa RX-391W 2.4Ghz FH-E 3-Channel Receiver. The RX-391W is a waterproof receiver, and is compatible with the Sanwa MX-6 radio system.Features:2.4GHz FH-E 3 ch (SPREAD SPECTRUM COMMUNICATION SYSTEM)WaterproofNOTE: RX-391W is not compatible with telemetry function.Specifications:Frequency: ..