Product parameters Output voltage: 1.25-12V Output current: 200mA Supply voltage: 220V Transformer power: 2.5W Power cord length: 1m Output line length: 20cm Shell size: length 11.2cm width 6.9cm height 4cm Shell material: transparent plastic shell (fix the upper and lower covers with 4 screws) Circuit board size: 7.2cm*6.2cm Product Features 1. 1.25-12V adjustable voltage regulator output, output current 200mA, suitable for powering small DIY circuits. 2. One adjustable signal generator output. It is convenient to provide pulse signal to the test circuit. 3. Logic pen function. It is convenient to test the logic level of the circuit. 4. With 1-way buzzer. You can test the continuity of the wire (connect the wire to the positive and signal input terminals of the power supply, the wire is connected - the buzzer will sound). It can also test low-frequency signals, (input the signal from the signal input terminal, if there is a signal, the buzzer will sound) Notice ! ! ! This product is a loose piece and needs to be welded and assembled by yourself. First of all, as a seller, we only guarantee that the product is in good condition before delivery, and cannot guarantee 100% success after installation. It requires the buyer to have circuit experience. We do not accept malicious disputes arising from the failure of the buyer to work properly due to installation errors. Please consider before paying. There are detailed installation instructions in the product, please read carefully and patiently look for the cause of the problem, rather than blame. Thanks! There is a risk of damage during the production process, please choose carefully! Each set is individually packaged with detailed installation instructions This kit is suitable for teaching training and beginner practice Because the output current is not large, it is only suitable for powering small current circuits If the power supply load is too large, the voltage will be pulled down. Can't charge the phone!