ESP32 Development Board Marauder Mar-X-Auder Device 2.8-Inch Screen Wi-Fi Bluetooth Tool Enable Sec Features: 1. Built-in latest firmware 1.8.4 2. 3D case design 3. Built-in TF card slot 4. Built-in 500mAh rechargeable lithium battery Specifications: Firmware version: 1.8.4 (Note: The firmware version is not fixed and be updated with new firmware releases. Currently, it is 1.8.4) Screen size: 2.8-inch resistive screen Applications: 2.4GHz WiFi, Bluetooth, GPS detection, etc. Battery: 500mAh Charging time: 1-2 hours External antenna specifications: GPS antenna: 20dBi active antenna 2.4GHz antenna: 8dBi antenna Color: Black Material: plastic Package Contents: 1 x ESP32 Development board 2 x antenna 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.