RadioMaster ER4 2.4GHz ELRS PWM Receiver

The RadioMaster ER4 is a small, 3g 4-channel PWM receiver built on ExpressLRS – a simple way to put a fast, reliable 2.4GHz link into small fixed-wing models, gliders, cars and boats. It plugs straight into servos and ESCs and reports receiver or external battery voltage automatically.

Key features

• 4 PWM channel outputs on 2.54mm headers
• Automatic voltage telemetry – external battery or receiver voltage
• 15cm high-sensitivity antenna
• Wi-Fi firmware updates and WebUI configuration
• Tiny and light: 30 x 15 x 5mm, 3.0g

Specifications

Compatibility

• For models without a flight controller: planes, gliders, cars and boats where servos and the ESC plug straight into the receiver. For FPV quads use a CRSF nano receiver instead (e.g. RP1 V2).
• 4 channels - throttle, aileron, elevator, rudder. Needs more (flaps, retracts)? Use the ER6 or ER8.
• Power: 4.5-8.4V from the ESC's BEC - standard servo-plug power.
• Radio: any ELRS 2.4GHz transmitter.

Works with (available at AeroFlow)

• RadioMaster Pocket radio (ELRS)
• RadioMaster TX16S MK3 radio (ELRS)
• RadioMaster GX12 radio

In the box

• 1x ER4 2.4GHz ELRS PWM receiver
• 2x heat-shrink tube
• 1x voltage telemetry wire (Type-A)
• 1x user card