The Sonoff Zigbee Gateway Hub USB 3.0 Dongle Plus is a device pre-flashed with the EZNet 6.10.3-based Zigbee coordinator firmware, making it ready to use. This dongle is compatible with smart home platforms such as Home Assistant, openHAB, Zigbee2MQTT, among others. It is based on EFR32MG21 and has an output gain of +20dBm. Its aluminum casing effectively reduces signal interference from peripherals. In addition, an optional 1.5m USB extension cable is included to improve signal range. As a Zigbee hub, the SONOFF ZBDongle-E can work with various devices, such as the ZBMINI/ZBMINIL2 Smart Switch and S26R2ZB Smart Plug, as well as the ZBMINI-L Smart Switch and ZigBee SNZB-01/02/02D/03/04 end devices.