Item Type: Morse Code Keyer Product Material: Aluminum 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 F2 key can remember 50 words; data is not protected during power loss R3 key controls speed; speed increases as the R3 value decreases Record: Press and hold F1/F2 for more than half a second; you will hear 'M', then CW recording begins automatically When complete, press F1/F2; you will 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, press three times, and so on Command Mode: Press F1 and F2 simultaneously; you will hear 'C', indicating 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) 'C' and 'E': Repeat playback; playback stops automatically after 255 cycles in 'E' mode To stop playback, press the short tone auto key; press again after hearing 'R' to confirm 'C' does not stop automatically but can be used as a signal; stop by pressing the short tone auto key and confirming with 'R' 'D': Exit command mode and return to normal mode 'T': Transfer command; active for 30 seconds, then returns to command mode