Alinan 2pcs LM317 DIY Kit Adjustable Regulated Voltage 110V to 1.25V-12.5V Step-Down Power Supply Module PCB Board Electronic Kits

PCB Board Size: 7.3 x 6.8cm (W / L) | Shell Size: 11 X 6.9 X 41.5cm (L / W / H) | One way adjustable signal generator output. Convenient to provide the pulse signal. | With a logical pen function. For convenient the logic level of test circuit. | With one way buzzer. You can test the wires on and off (connect the wires to the power positive and signal input, the wire on - the buzzer sound). You can also test the low-frequency signal (input the signal from the signal input, if there is a signal, the buzzer sound).