RadioMaster ER4 4-Channel 2.4 GHz ELRS PWM Receiver

RadioMaster ER4 4-Channel 2.4 GHz ELRS PWM Receiver

Product description

The RadioMaster ER4 is a compact and exceptionally lightweight 4-channel ExpressLRS 2.4 GHz PWM receiver for RC airplanes, gliders, and other RC models. Thanks to modern ELRS radio technology, it offers a reliable radio link with low latency and long range.

With four PWM outputs, integrated voltage telemetry, and a weight of just 3 g, the ER4 is particularly well-suited for small RC models with limited space.

4 PWM Channels with ExpressLRS 2.4 GHz

The RadioMaster ER4 allows for the direct connection of up to four servos. The ExpressLRS 2.4 GHz radio protocol ensures fast response times and stable signal transmission. The 15 cm long high-performance antenna supports a reliable radio connection.

Integrated Voltage Telemetry

The receiver supports monitoring of the receiver voltage as well as an external flight battery voltage ranging from 4 to 35 V. Automatic selection of the voltage measurement simplifies setup. The telemetry transmission power is 10 mW.

Compact Design and Easy Configuration

With dimensions of just 30 × 15 × 5 mm, the ER4 can be installed even in very small model fuselages. The high-quality 2.54-mm connectors allow for direct connection of servos.

Thanks to built-in Wi-Fi, firmware updates and settings can be conveniently managed via the WebUI.

Features

• 4-channel PWM receiver with ExpressLRS 2.4 GHz
• Suitable for RC airplanes, gliders, and other RC models
• Four PWM outputs for servos
• Low latency and reliable radio transmission
• 15 cm high-performance antenna
• Integrated receiver voltage telemetry
• External flight battery voltage measurement from 4 to 35 V
• Automatic selection of voltage measurement
• Telemetry transmission power: 10 mW
• Wi-Fi firmware updates and WebUI configuration
• High-quality 2.54-mm servo connectors
• Compatible with ExpressLRS 2.4 GHz remote controls
• Extremely compact and lightweight design
• Weighs only 3 g

Technical Specifications

General

• Manufacturer: RadioMaster
• Model: ER4
• Part Number: HP0157.RX-ER4
• Product Type: 4-Channel PWM RC Receiver
• Radio Protocol: ExpressLRS 2.4 GHz
• Pre-installed firmware according to the manufacturer: ExpressLRS 3.3.0

Channels & Radio Technology

• PWM Outputs: 4
• Frequency band: 2.4 GHz
• Antenna: 15 cm high-performance antenna
• Telemetry transmission power: 10 mW
• Servo connectors: 2.54 mm
• Wi-Fi / WebUI: Yes

Power Supply & Telemetry

• Operating voltage: 4.5–8.4 V DC
• External voltage measurement: 4–35 V DC
• Receiver voltage telemetry: Yes
• Flight battery voltage telemetry: Yes
• Automatic voltage measurement selection: Yes

Dimensions & Weight

• Dimensions: 30 × 15 × 5 mm
• Weight: 3 g
• Antenna length: 15 cm