1. Features a voltmeter display with a 0.1V measurement accuracy and a voltage range of 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 measured. 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 selected mode even after power cycling. 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, solder-free connections. Connection points are provided. Note: Input voltage must be at least 1V higher than output voltage. 5. Maximum output current is up to 3A; recommended operating current is approximately 2A. A heatsink is recommended when operating above 2A. 6. Operates with an internal switching frequency of 400kHz, utilizing second-generation switching regulator technology for high efficiency and low power consumption. 7. Suitable for boost applications where output voltage exceeds input voltage, such as battery systems, power supplies, DIY adjustable voltage regulators, 24V车载笔记本 power adapters, industrial equipment step-down applications, and voltage conversions such as 9V to 12V, 12V to 18V, and 18V to 24V. Input Voltage Range: 4.5V to 32V Output Voltage Range: 5V to 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 and electronic components Package Contents: 2 x XL6009 DC-DC Boost Module Note: The package includes only the items listed above. Other accessories are not included. Note: Lighting conditions and monitor settings may cause slight color variations between the product image and the actual item. Measurement tolerances are within +/- 1-3cm.