We provide 3 open source programme codes which can achieve the following functions. [Wait for the display to light up, input different signal codes by pressing the key, press the key lightly for (·), press the key for three seconds for (＿), the display will automatically translate the English letters, only one can be translated at a time. Press and hold the key for three seconds, the display will automatically translate the English letters, only one letter can be translated at a time. (PC Serial Dialogue Box Sending Program) Connect the kit to PC, send English letters or words through the serial dialogue box of Mixly software, the telegraph will be converted to Morse code in real time. (Bluetooth Dialog Sender) Connect the Bluetooth via mobile phone APP, then send English letters or words in the dialogue window of APP, the telegram will be converted to Morse code in real time. You can also use Arduino IDE, Mixly and other programming software to modify the example program or write a program to control the telegraph (Morse code). Note: Due to different product batches, the appearance may have differences, does not affect the use of Power supply: 2 3.7V 18650 lithium batteries (batteries not included) Colour:Wood Material:Wood+Electronic Components Package Contents: 1 x Telegraph DIY material package (DIY kit, need to assemble by yourself) 1 x U+ program card 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.