Features: 1. Built-in latest 1.8.4 firmware 2. 3D case design 3. Supports Fat32 TF cards (please provide your own memory card) and supports TF card firmware upgrades 4. Built-in 500mAh rechargeable lithium battery 5. Five-way rocker switch for smooth operation 6. Supports GPS positioning and an external 20dB gain antenna, enabling signal acquisition in seconds outdoors or on a balcony. Parameters: 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: 1.44 inches Compatible with: 2.4GHz WiFi, Bluetooth, GPS detection, etc. Battery: 500mAh Charging Time: 1-2 hours Note: This product is for learning purposes only Color: Black Material: ABS Package Contents: 1 set of ESP32 Marauder 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.