Using MCU (Micro Controller Unit), the Blue Arrow R3P4 J receiver can identify automatically whether the transmitter signal is positive or negative shift. There is no need to use a switch to identify.
This receiver is very light, it only weighs 3.5g/0.12oz. It is recommended for indoor aircraft applications that require a reliable and short remote distance unit. This receiver is compatible with PPM transmitter: ESKY, HITEC, FUTABA, JR, MULTIPLEX, AIRTRONICS and most other transmitters.
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