The 868/915MHz antenna needs to be in connection with the IPEX interface (if the antenna is not connected, the signal reception will be unstable)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 Press screen Press signal input, you need to add the 100nF pull-down capacitor to this pin Example:This product is a SX1276 chip based on ESP32 WIFI increased OLED, namely LoRa remote modem, 868-915MHz frequency, high sensitivity is over-148dBm, + 20dBm output power, high reliability, long transmission distance.the onboard 4Mt bytes (32 Mt bit) wi-fi antenna, 0.96 inch oled display, lithium battery charging circuit, CP2102 interface and USB serial chip, the perfect support for Arduino development environment, can be used for program checking and product development is very easy and fast.Operating voltage: 3.3V to 7VOperating temperature range: -40 Celsius to + 90 CelsiusSupport for Sniffer software protocol analysis, Station, SoftAP, and Wi-Fi Direct modesData rates: 150 Mbps @ 11n HT40., 72 Mbps @ 11n HT20, 54 Mbps @ 11g, 11 Mbps @ 11btransmit power: 19.5 dBm @ 11b, 16.5 dBm @ 11g, 15.5 dBm @ 11nreceiver sensitivity up to -98 dBmUDP sustained throughput of 135 MbpsColour:blackMaterial:Metal+PCPackage Contents:1 x Bluetooth WIFI ESP-32 development board moduleOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.