RadioMaster ER4 2.4ghz PWM ELRS 4 Channel Receiver
by RadioMaster

Product Description
Experience next-level performance and reliability with the RadioMaster ER4 2.4GHz PWM ELRS 4 Channel Receiver. Powered by the revolutionary ExpressLRS 3.3.0 protocol, this ultra-compact receiver offers lightning-fast response speeds and exceptional long-range capabilities for RC airplanes, FPV drones, boats, and cars. Designed to power four servos simultaneously, its compact 30×15×5 mm footprint and lightweight 3 g design make it the ideal choice for small-scale models or projects requiring a minimal, full-range receiver.

Enjoy easy Wi-Fi updates, WEBUI configuration, and voltage telemetry for external or built-in receiver batteries. The ER4 supports a wide input power range of DC 4.5–8.4V, features a high-sensitivity 15 cm antenna for rock-solid signal reception, and provides 4 PWM output channels. This comprehensive solution ensures smooth control, reliable connectivity, and versatile functionality across your favorite RC hobby applications.

Specifications

• Item: ER4 2.4GHz ELRS PWM Receiver
• Power Supply: DC 4.5–8.4V
• Antenna Type: 15 cm high-sensitivity antenna
• Wireless Protocol: ExpressLRS 3.3.0 (pre-installed)
• Output Channel: 4CH PWM
• Telemetry Power: 10 mW
• Battery Voltage Detection Range: DC 4.0–35V
• Weight: 3.0 g
• Dimensions: 30×15×5 mm
• Firmware: RadioMaster ER4 2400 PWM RX

Package Includes

• 1 × ER4 2.4GHz ELRS PWM Receiver
• 2 × Heat-shrink tubes
• 1 × Voltage telemetry wire (Type-A)
• 1 × User Card