ER3C-i receiver is based on the high-performance, revolutionary ExpressLRS system, featuring high reliability, highly flexible configuration, ultra-fast response speeds, and an ultra-long receiving range, bringing with it a brand- usage experience. The ER3C-i ELRS receiver can drive up to 3 servos and has built-in receiver voltage telemetry and battery telemetry with the ability to automatically detect which voltage input to use. The ER5C-i features a built-in high-sensitivity ceramic antenna, it is designed for all types of surface models and provides a clean install without antenna wires to worry about. Built-in high-sensitivity ceramic antenna Based on the Revolutionary ExpressLRS System High performance, high reliability, flexible configuration, fast response speed and ultra-long range Support 5 PWM Channels Automatically detects voltage telemetry of external battery voltage or receiver battery /ESC BEC voltage Optimized ground up PCB design Supports Wi-Fi updates and WEBUI configuration Built-in a TCXO (temperature compensated crystal oscillator),ensure stable and accurate performance in any environment Designed for all types of surface models Antenna type: Built-in high-sensitivity ceramic antenna Wireless protocol: ExpressLRS 3.3.0 pre-installed Telemetry power: 10mW Battery voltage detection range: DC 4.0- 35V Firmware: Device Category: Radiomaster 2.4Ghz / Device: RadioMaster ER5C-i Colour:Black Material:composite materials Item: ER3C-i 2.4GHz ELRS PWM Receiver Output channel: 3CH PWM Weight: 4.2 grams Dimensions: 26.1x18.5x13.0 mm Power supply: DC 4.5 - 8.4V Package Contents: 1 x 2.4GHz ELRS PWM Receiver 1 x Voltage telemetry wire