MX-K2 CW Keyer Automatic Key Controller for Radio Amplifiers With memory and segmented memory functions, frequently used instructions are stored. Only two buttons and a switch for easy operation. Includes power-off protection function and super power-saving mode. Adjustable speed switch; the control board's potentiometer can be adjusted at any time. Power supply: 2 x AAA batteries (NOT included) How to use: J1: Mute buzzer L/R: di/da or da/di The F1 button can store 60 words and has a power-off protection function. The F2 button can store 50 words and does not protect the data if the power supply fails. The R3 button is used for speed control; the speed increases as the value of R3 decreases. Recording: Press and hold F1/F2 for more than half a second. Hear 'M', CW is now being recorded automatically. When everything is ready, press F1/F2, you will hear "S". It will remind you with "F" if you exceed the volume, and the extra par it will not be recorded. Message: Each message can not only be stored in a long memory, it can also be divided into several segments by entering EOM (End of Message) at the end of each segment. Playing back segments: If you want to play back the second segment, simply press the memory key twice; If you want the third one, press the key 3 times, and so on. Command mode: Press F1 and F2 simultaneously; you will hear "C"; it is now in command mode. Exit command mode: Press F1 and F2 simultaneously again, or you can enter "D" by pressing the Auto key. Color: Black Material: Metal Package contents: 1 * Morse code auto memory key controller Only the above package contents; other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the real thing. The allowable measurement error is +/- 1-3 cm.