RadioMaster ER4 2.4GHz ELRS PWM Receiver

The RadioMaster ER4 is an ultra-compact 4-channel PWM receiver bringing the exceptional range and low latency of the 2.4GHz ELRS protocol to traditional RC aircraft, ground vehicles, and custom surface projects. By outputting direct PWM, this receiver allows you to drive servos and ESCs without requiring a dedicated flight controller, making it an ideal choice for micro fixed-wing builds, DLG gliders, and lightweight robotics.

Key features

• Direct 4-channel PWM output eliminates the need for a flight controller or external CRSF-to-PWM converter.

• Integrated voltage telemetry supports up to 35V, allowing real-time flight battery monitoring on your radio.

• Accepts 4.5V to 8.4V direct input, fully supporting modern high-voltage (HV) servo setups.

• Streamlined 3g footprint easily fits into restricted glider fuselages and micro equipment bays.

Specifications

• Frequency: 2.4GHz

• Channels: 4x PWM

• Operating Voltage: 4.5–8.4V DC

• Telemetry Power: 10mW

• Voltage Detection Range: 4.0–35V DC

• Dimensions: 30 x 15 x 5 mm

• Weight: 3.0 g

• Firmware Target: RadioMaster ER4 2400 PWM RX

Wire the included telemetry cable directly to your main flight battery to enable accurate voltage reporting. Ensure your transmitter is updated to a compatible ELRS firmware version before binding.