RadioMaster ER4 2.4GHz ELRS PWM Receiver 4CH for Small Aircraft/ RC Cars/ Boats
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Specifications
- Brand Name
- RADIOMASTER
- High-concerned chemical
- None
- Origin
- Mainland China
- Weight
- 3g
- Package
- Yes
- Model Number
- ER4
- Certification
- CE, FCC
Product Description
The RadioMaster ER series of PWM receivers are based on the revolutionary ExpressLRS system. It offers high performance, high reliability, flexible configuration, fast response speed and ultra-long range bringing you brand new experience with your hobby.
The ER4 PWM receiver can drive 4 servos simultaneously. Designed with a very small volume, it is suitable for small aircraft models, ship models, car models and other models that require a small or lightweight receiver while still providing full range.
Features
Based on the Revolutionary ExpressLRS System
High performance, high reliability, flexible configuration, fast response speed and ultra-long range
Support 4 PWM Channel
Optimized ground up PCB design
Automatically voltage telemetry of external battery voltage or built-in receiver voltage
Supports Wi-Fi updates and WEBUI configuration
High quality 2.54 mm connector
Standard 15 cm High Sensitivity Antenna
For small aircraft, boats and cars and more
Compatible with all 2.4GHz ExpressLRS modules and transmitters with built in 2.4GHz ExpressLRS
Specification
Item: ER4 2.4GHz ELRS PWM Receiver
Power supply: DC 4.5 - 8.4V
Antenna type: 15cm high sensitivity antenna
Wireless protocol: ExpressLRS 3.3.0 pre-installed
Output channel: 4CH PWM
Serial Output: CRSF / Sbus
Telemetry power: 10mw
Battery voltage detection range: DC 4.0- 35V
Weight: 3.0 grams
Dimensions: 30*15*5mm
Firmware: Device Category: Radiomaster 2.4Ghz / Device: RadioMaster ER4 2.4GHz PWM RX
Size
Package Includes
1 * ER4 2.4GHz ELRS PWM Receiver
2 * Heat-shrink tube
1 * Voltage telemetry wire (Type-A)
1 * User Card
Pros & Cons
Pros
- Ultra-lightweight 3g for small RC models.
- ExpressLRS 2.4GHz for long range and reliability.
- Drives 4 servos simultaneously with PWM output.
- CE/FCC certified for quality.
Cons
- PWM only, no SBUS or other protocols.
- No built-in diversity antennas.
- Limited to 4 channels.
- Basic packaging, no extras.
Common Questions
What channels and frequency does the RadioMaster ER4 receiver support?
4CH PWM receiver, 2.4GHz ELRS.
What is the weight and compatibility of this RC PWM receiver?
3g weight, for small aircraft, RC cars, boats.
Does this ExpressLRS receiver have certifications?
CE, FCC certified.
What performance features for this RadioMaster ER series receiver?
High performance, ultra-long range, fast response, flexible config.
What is included and origin for shipping this ER4 ELRS receiver?
Package: Yes. Origin: Mainland China.
Product information last updated on January 16, 2026