DIY parts need to be welded and assembled by yourself, and welding tools are required. Upgraded CW Morse code decoder, optimized circuit board and component layout, better installation. Function upgrade, simpler and more convenient operation, support audio decoding, external CW button, can directly decode the received Morse code audio into characters, adjustable decoding speed, buzzer. Simulated sound, free sound switch, making learning Morse code easier to understand. Upgraded CW Morse code decoder Power supply:USB power supply 5V Working voltage:5V Static working current:about 25mA (without decoding) Maximum working current:about 60mA (with decoding buzzer) Functional features 1. CW audio signal input 2. Display received Morse code 3. Decode received Morse code audio into characters 4. Display receiving code rate 5. Adjust the receiving Morse code time 6. External cW button for practicing sending Morse code 7. Use buzzer to listen to received Morse code in real time Tips:The product may be updated constantly, Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use. Colour:As Shown Material:Plastic Package Contents: 1 * DIY Welding Practice Kit(DIY parts, need to be welded by yourself) 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.