Application:Internet of Things,Wearable devices,Health monitoring,Education,Low-Power(LP) networking ,Rapid prototyping, This is a peer-to-peer WiFi communication application, since two XIAOs detect each other via Wifi, the garage door open or keep opening, and vice . Thanks to the tiny size of the XIAO series, it is suitable to make the wearable devices, such as a small pet tracker. This wearable device can be used as a simple GPS-Tracker which lock its current location and publish other data via LoRa. Due to different factory batches, the product words are different, and the product accessories have slight differences in color and appearance, but it does not affect normal use Colour:Photo Color Material:PCB Package Contents: 5 x XIAO ESP32 C3 development board Only the above package content, other products are not included. Note: Light reflection 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.