ER5C-i 2.4GHz ELRS PWM Receiver
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Product Overview
The RadioMaster ER5C-i receiver is built around the innovative ExpressLRS protocol, delivering high performance, reliable signal transmission, flexible configuration, and fast response times for a wide range of R/C projects and applications.
The ER5C-i ELRS receiver supports up to 5 servo channels and features built-in receiver voltage telemetry and battery voltage telemetry, with automatic detection of the appropriate voltage input.
Featuring a built-in high-sensitivity ceramic antenna, the ER5C-i eliminates the need for external antenna wires, providing a clean and streamlined installation. Designed for all types of surface R/C models, it delivers reliable performance while keeping your setup neat and hassle-free.

Features
- Built-in high-sensitivity ceramic antenna for a clean, antenna-wire-free installation
- Built on the revolutionary ExpressLRS protocol
- Delivers high performance, reliable signal transmission, flexible configuration, low latency, and excellent link quality
- Supports 5 PWM channels
- Automatically detects and monitors external battery voltage or receiver/ESC BEC voltage
- Ground-up optimized PCB design for improved performance and reliability
- Supports Wi-Fi firmware updates and WebUI configuration
- Built-in TCXO (Temperature-Compensated Crystal Oscillator) for stable and accurate performance across a wide range of operating conditions
- Designed for all types of surface R/C models
- Compatible with all 2.4GHz ExpressLRS modules and transmitters with built-in 2.4GHz ExpressLRS
Specifications
- Item: ER5C-i 2.4GHz ELRS PWM Receiver
- Power supply: DC 4.5 - 8.4V
- Antenna type: Built-in high-sensitivity ceramic antenna
- Wireless protocol: ExpressLRS 3.3.0 pre-installed
- Output channel: 5CH PWM
- Telemetry power: 10mW
- Battery voltage detection range: DC 4.0 - 35V
- Weight: 5.0 grams
- Dimensions: 30.0*18.5*13.0 mm
- Firmware: Device Category: Radiomaster 2.4Ghz / Device: RadioMaster ER5C-i








Package Includes
- 1 * ER5C-i 2.4GHz ELRS PWM Receiver
- 1 * Voltage telemetry wire
- 1 * User Card