Item Type: Morse Code Keyer Product Material: Aluminium Alloy Product Model: MX-K2 How to Use: Battery: 2 x AAA Battery (not included) J1: Buzzer mute L/R: di/da or da/di F1 key can remember 60 words and has power-off protection function F2 key can remember 50 words; it does not protect data when power is lost R3 key is for speed control; speed increases as the value of R3 decreases Record: Press and hold F1/F2 for more than half a second to hear "M"; recording begins automatically When complete, press F1/F2 to hear "S" If capacity is exceeded, you will hear "F"; the excess content will not be recorded Message: Messages can be stored in long-term memory and divided into segments by entering EOM (End of Message) at the end of each segment Play Segmentation: To play the second segment, press the memory key twice; for the third segment, press three times, and so on Command Mode: Press F1 and F2 simultaneously to hear "C"; device is now in command mode Exit Command Mode: Press F1 and F2 together again or input "D" using the auto key When using the auto key, the system responds with "R" for valid commands and "?" for invalid ones "A": Turn off long-short tone memory "B": Turn on long-short tone memory (most commonly used command) "C" and "E": Repeat playback; under command "E", playback stops automatically after 255 cycles To stop playback, press the short tone auto key; press again and confirm "R" response to exit "C" does not stop automatically but can be used as a signal; stop by pressing the short tone auto key, then confirm "R" to exit "D": Exit command mode and return to normal mode "T": Transfer command; active for 30 seconds, then returns to command mode