FrSky RX4R EU Naked Receiver (without case)This is the naked version of the RX4R that allows you to solder your wires directly to save some weight. The RX4R is a standalone receiver with all the functions of X4R, it features 4 PWM outputs with high precision and low latency. The PWM output latency is 9ms less than that of the X4R in high speed mode. The RX4R also supports the redundancy function, this means you can add another receiver as a back up in case the first one fails. Last but not