T TWR Plus Introduction T TWR Plus is an ESP32 development board developed by LILYGO® with the main function of a walkie talkie In addition to the basic version an OpenEdition version is cooperated by the M17OpenRTX community The development board has several key features Walkie Talkie Functionality Integrated Wi Fi and Bluetooth GPS for Location Tracking OLED Display SA868 Wireless Transceiver TF Card Slot for Storage Battery powered It can be used in various scenarios including outdoor activities industrial environments IoT projects navigation and geolocation emergencies and personal use More information GithubNotice This product is a development board module whose purpose is to use for verification test experiments When purchasing it must be used by local wireless management regulations and select a frequency that complies with local laws and regulations OpenEdtion used SA868 open edition module which internal Micro controller is erased and left blank after the Factory QA test There is no published open source firmware so you cannot test the RF functionality directly on them you need to develop it yourself or follow the progress of the open source community