| Feature | Specification | | :--- | :--- | | | 5V DC (via USB) | | Operating Voltage | 3.3V / 5V (Selectable or Auto-detect) | | Communication | Full Duplex Serial (RX/TX) | | Max Baud Rate | Up to 230400 bps (tested stable) | | Display | 0.96" SSD1306 OLED (I2C) - Standard Config | | Interface | Micro-USB or USB-C (depending on specific board revision) | | Dimensions | Approx. 50mm x 25mm (Stick form factor) |

The v1.0.4 update introduced several stability improvements and functionality enhancements over its predecessors:

at-cmd --version # Expected output: at Command Station v1.0.4

There is no web browser, no email client, and no social media. The v1.0.4 firmware focuses entirely on text manipulation and file management via a minimalist command-line interface.