<p>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.</p><p><br></p><p>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.</p><p><br></p><h4><b><br></b></h4><h4><b>Features</b></h4><p><br></p><ul><li><p>Based on the Revolutionary ExpressLRS System</p></li></ul><ul><li><p>High performance, high reliability, flexible configuration, fast response speed and ultra-long range</p></li></ul><ul><li><p>Support 4 PWM Channel</p></li></ul><ul><li><p>Optimized ground up PCB design</p></li></ul><ul><li><p>Automatically voltage telemetry of external battery voltage or built-in receiver voltage</p></li></ul><ul><li><p>Supports Wi-Fi updates and WEBUI configuration</p></li></ul><ul><li><p>High quality 2.54 mm connector</p></li></ul><ul><li><p>Standard 15 cm High Sensitivity Antenna</p></li></ul><ul><li><p>For small aircraft, boats and cars and more</p></li></ul><p><br></p><p><br></p><p><br></p><p><br></p>