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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
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
- 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 2400 PWM RX
Package Includes
- 1 * ER4 2.4GHz ELRS PWM Receiver
- 2 * Heat-shrink tube
- 1 * Voltage telemetry wire (Type-A)
- 1 * User Card
Ben R
Reviewed in the United States on February 20, 2025
I bought a Radiomaster Pocket radio to use with this Receiver in a battleship I built. It worked so well. It is a really nice reliable 4 channel ELRS Receiver. I'm using a 6v battery connected through a Y cable so I can use all 4 channels.
NateDJ
Reviewed in the United States on January 14, 2025
This is my GoTo for any time I need a 4ch ELRS receiver. Never had any problem with them. Have also used them when needing an SBUS receiver to connect to a 4ch Gyro Stabilizer but also needed 1 or 2 more channels such as for flaps or retracts. SBUS protocol takes channel 2 and 3 letting you reassign channel 1 and 4 to whichever channel you need it to be usually channel 8 and 9 for me as 1-7 are used with the SBUS Gyro.
Michelle Pangelinan
Reviewed in the United States on November 26, 2024
Solid unit
Gary
Reviewed in the United States on October 28, 2024
If you want a solid 4 channel receiver with battery telemetry, look no further. The form factor is quite small: it's a bit big for flying FPV, but it fits in pretty much any fixed wing plane. It is ELRS of course; if you're not using ELRS, you should start. They have made great strides recently in fixed wing support, and I understand there are more in the works.You may be looking for the battery telemetry connector: unlike the bigger RadioMaster receivers, there isn't one! But there's a pad where you can solder a wire (the wire and replacement heat shrink sleeves are included).All in all, this has become my go-to everyday receiver for less complex airplanes - small EDF jets, 3D planes, slope soarers. Get some!
Big Howie
Reviewed in the United States on October 3, 2023
Great
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