The E22-400T30D is a 24x43mm RoHS compliant LoRa module manufactured by Ebyte. It is a tiny radio frequency module designed to allow long range data transmission. It offers up to 400 meter transmission range, supports up to 30 dBm transmit power, and works at an 860 MHz frequency for low power use. It has adjustable transmit power level, communication speed of up to 200 kbps, and uses LoRa Spread Spectrum Modulation. It is suitable for applications such as home and building automation, security systems, smart city infrastructure, remote meter reading, industrial and agricultural automation, and so on.