Usage Tips:Features: CW speed adjustable from 1 to 999 WPM Programming and interfacing via USB port ("command line interface") PTT output with configurable lead, tail, and hang times 2 memories with macros Purchase Notes: This product has many functions. The finished product can directly use the installed program and set it up with the software. Dimensions 50x58x24 mm. Serial numbers CW keyboard (via a terminal server program like Putty or the Arduino Serial program) Speed potentiometer (speed also adjustable with commands) QRSS and HSCW Beacon / Fox mode Iambic A and B Straight key mode Ultimatic mode Bug mode Paddle reverse Farnsworth Timing Adjustable frequency sidetone Sidetone disable Command mode for using the paddle to change settings, program memories, etc. Keying Compensation Dah to Dit Ratio adjustment Weighting Callsign receive practice Send practice Memory stacking Logging and Contest Program Interfacing via K1EL Winkey 1.0 and 2.0 interface protocol emulation "Dead Operator Watchdog" Autospace Wordspace Adjustment Pre-configured and Custom Prosigns Non-volatile storage of most settings Modular code design allowing selection of features and easy code modification Color: blue Material: aluminum+electronic components Package Contents: 1 x Open CW keyer MK2 KIT 1 x cable 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.