1. Features a voltmeter display with a 0.1V measurement accuracy, operating range from 5V to 35V. Note: The onboard voltmeter will not function or display if the input voltage is below 4.5V. 2. Press the button to toggle between input and output voltage measurement. An indicator light shows which voltage is being displayed. On initial power-up, the digital display defaults to input voltage with the IN indicator lit. Pressing the button switches to output voltage display with the OUT indicator lit. The module retains the last setting even after power cycle. 3. The voltmeter can be turned off by pressing the switch for more than 1 second but less than 4 seconds, then releasing. To reactivate, press the button briefly. 4. Equipped with terminal blocks for easy wiring without soldering. Connection points are provided. Input voltage must be at least 1V higher than the output voltage. 5. Maximum output current up to 3A; recommended operating current is approximately 2A. A heat sink is recommended when current exceeds 2A. 6. Utilizes a 400kHz internal oscillation frequency, part of the second-generation switching voltage regulator technology, offering low power consumption and high efficiency. 7. Suitable for boost applications where output voltage exceeds input voltage, such as battery systems, DIY adjustable voltage regulators, 24V车载 notebook power supplies, industrial equipment step-down applications, and voltage conversions like 9V to 12V, 12V to 18V, 18V to 24V, etc. Input Voltage Range: 4.5V – 32V Output Voltage Range: 5V – 35V (adjustable) Maximum Input Current: 4A Note: Minor variations in silkscreen or appearance may occur between batches; these do not affect functionality. Color: Blue Material: PCB + Electronic Components Package Contents: 2 x XL6009 DC-DC Boost Module The package includes only the items listed above. Note: Lighting conditions and display settings may cause slight color variations between the image and the actual product. Measurement tolerance is +/- 1–3 cm.