Electric key interface: Connect the manual key or automatic key directly. To connect the manual key, connect it first, then connect the mobile phone or computer. The device automatically detects whether a manual or automatic key is connected. Button: Switches between Mode 1 and Mode 2. Press and hold to pair with a computer or mobile phone and toggle modes. In Mode 1, pressing and holding moves the cursor downward; when the cursor reaches the bottom of the mobile screen and the button is held continuously, the cursor moves upward from the bottom. Indicator light: Shows operating status. Solid light indicates Mode 1 — suitable for mouse-operated training software or apps (e.g., Lakey, CWPlayer, MorseTrainer). Flashing light indicates Mode 2 — suitable for specific training software or apps (e.g., VBand website, MorseMania, MorseIt). USB-C interface: Connect to a computer using a standard USB-C power cable, or connect to a mobile phone using a dual USB-C data cable. Built-in OTG circuit eliminates the need for an external OTG adapter. Product appearance and printed text may vary slightly between batches, but functionality remains unaffected. Specifications: USB-A interface or USB-C interface Color: As shown Material: ABS Package Contents: 1 × Morse Code CW Trainer Note: Colors may vary slightly due to screen settings and lighting conditions. Measurement tolerance: ±1–3 cm.