Description:  The 868MHz antenna needs to be in connection with the IPEX interface (if the antenna is not connected, it may damage the LoRa chip) Lithium battery charge and discharge circuit, when the battery is full, the blue LED will stop working. When using, pay attention to the positive and negative of the battery, otherwise it will be damaged   With IO port touch screen touch signal input, you need to add the 100nF pull-down capacitor to this pin      Example:  The products is a SX1276(868) chip based on ESP32 WIFI increased OLED, namely LoRa remote modem, 868MHz frequency, high sensitivity is over-148dBm, + 20dBm output power, high reliability, long transmission distance.  the onboard 868MHz 4Mb bytes (32 Mb bit)wi-fi antenna, 0.96 inch blue oled display, lithium battery charging circuit, CH9102X interface and USB serial chip, the perfect support for development environment, can be used for program checking and product development is very easy and fast.  Operating voltage: 3.3V to 7V.  Operating temperature range: -40 to + 90 degree.  Support for Sniffer software protocol analysis, Station, SoftAP, and Wi-Fi Direct modes.  Data rates: 150 Mbps @ 11n HT40., 72 Mbps @ 11n HT20, 54 Mbps @ 11g, 11 Mbps @ 11b.  transmit power: 19.5 dBm @ 11b, 16.5 dBm @ 11g, 15.5 dBm @ 11n.  receiver sensitivity up to -98 dBm.  UDP sustained throughput of 135 Mbps.     Package included:  2 x 0.96 Inch OLED 868MHz 2 x Spring Antenna 2 x USB Cable