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, 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 small aircraft, boats and cars and more
Compatible with all 2.4GHz ExpressLRS modules and transmitters with built in 2.4GHz ExpressLRS