Chengdu Ebyte Electronic Technology Co.,Ltd. E73-2G4M08S1EX User ManualCopyright ©2012–2021,Chengdu Ebyte Electronic Technology Co.,Ltd. 3Features 13 x 18mm, small size; Support Bluetooth 5.1, Bluetooth mesh, 802.15.4, Thread, Zigbee and proprietary 2.4 GHz protocols; Maximum transmission power of 6mW, software multi-level adjustable; Support the global license- free ISM 2.4GHz band; Built-in high performance low power ARM⑧and Cortex⑧-M4 dual core processor; Rich resources,512KB FLASH, 128KB RAM; Support 1.7V~5.5V power supply, power supply over 3. 3Vcan guarantee the best performance; Industrial grade standard design, support -40 ~ 85 °C for working over a long time; With IPEX antenna interface, an external antenna is required; Under ideal conditions, the communication distance can reach 120m.