This is the new Waterproof Sanwa RX-471W 2.4GHz FHSS-4 Surface Receiver. The RX-471W is a Super Response surface receiver that features 4-channels, FH3 or FH4 switching and 7.4V 2S LiPo compatibility.
Nominal Input Voltage: 4.8-7.4V
Weight: 0.23oz (6.6g)
Dimensions: 1.18x0.91x0.55 in (30.0x23.3x14.0mm)
Frequency: 2.4GHz FH3/FH4 Selectable Via Transmitter
Fail-Safe Support: Yes (All Channels)
Battery Voltage Fail-Safe Limit: 3.5-5.0V (FH3) / 3.5-7.4V (FH4)