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ER4 2.4GHz ELRS PWM Receiver

FPV Receiver

The RadioMaster ER series of PWM receivers is built on the innovative ExpressLRS protocol. It provides high performance, dependable signal, versatile configuration, and quick response time, offering a new experience…

Specifications

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SKU: HP0157.RX-ER4
$14.99
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The RadioMaster ER series of PWM receivers is built on the innovative ExpressLRS protocol. It provides high performance, dependable signal, versatile configuration, and quick response time, offering a new experience for your projects and applications. The ER4 PWM receiver can drive 4 servos simultaneously. Designed for a very small volume, it is suitable for any application that requires a small or lightweight receiver while still providing full range. Features Based on the Revolutionary ExpressLRS System High performance, high reliability, flexible configuration, low latency, and strong link quality 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 any application that requires a small or lightweight receiver 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 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 RadioMaster ER Series Receivers ER4 ELRS PWM Receiver ER6 ELRS PWM Receiver ER8 ELRS PWM Receiver ER6G/ER6GV ELRS PWM Receiver ER8G/ER8GV ELRS PWM Receiver Package Includes 1 * ER4 2.4GHz ELRS PWM Receiver 2 * Heat-shrink tube 1 * Voltage telemetry wire (Type-A) 1 * User Card ER4 Receiver is installed with ExpressLRS as standard. ExpressLRS is an open-source, high-performance radio control link that delivers exceptional range and low-latency communication using advanced LoRa technology. It’s highly customizable and perfect for RC enthusiasts looking for reliability and efficiency. Pair your ExpressLRS with Radiomaster’s top-tier transmitters and receivers. Radiomaster products are designed to maximize the benefits of ExpressLRS, offering state-of-the-art performance for your RC adventures. Upgrade your RC experience with the unbeatable combination of ExpressLRS and Radiomaster—engineered for excellence and tailored for you. Find out more about ExpressLRS here

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Frequently Asked Questions

Is this product in stock?
Yes — this item ships from our Shenzhen warehouse within 1–3 business days. Stock levels are updated regularly; contact our sales team for current availability and lead time on larger quantities.
Do you support OEM / ODM and custom branding?
Yes. As a factory-direct supplier we accept OEM/ODM orders including custom branding, packaging and firmware/parameter customization. Share your requirement with our sales team to get a tailored quote.
How do you ship, and what is the delivery time?
We ship worldwide via DHL, FedEx, UPS or air/sea freight. Small parcels usually arrive in 5–10 working days; bulk orders can be shipped by sea. Tracking is provided once the parcel leaves our warehouse.
Do you offer wholesale pricing and MOQ?
Yes, as a factory-direct supplier we offer wholesale pricing on this product. The minimum order quantity depends on the item and configuration — send your quantity and destination to our sales team and we will reply with an exact quote.
Do you provide warranty and after-sales support?
Yes, we provide technical support and after-sales service for our products. For the warranty terms specific to this product, contact our team and we will confirm the coverage period and the repair/replacement process.
Can you confirm compatibility before I order?
Yes. Before dispatch we can confirm that the product matches your radio, flight controller, goggles, frame or other equipment. Send us your build list and our engineers will verify compatibility before you place the order.

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