LTC1871 DC-DC Boost Converter is a DC-DC Boost Module and a Power Voltage Regulator, with an Input Range of 3-35VDC and an Output Range of 3.5-35VDC,

LTC1871 DC-DC Boost Converter is a DC-DC Boost Module and a Power Voltage Regulator, with an Input Range of 3-35VDC and an Output Range of 3.5-35VDC,

Input Voltage Range: 3 - 35V DC Output Voltage Range: 3.5 - 35V DC Efficiency: 96.7% (Maximum) Output Current: 6A (Maximum) Dimensions: 2.6 x 1.7 x 0.45 inches (Approx. 6.7 x 4.3 x 1 cm)
Features:

Input Voltage: 3 - 35V DC (Note: When the input voltage is less than 4V, the onboard voltmeter will cease to function).

Input Current: 9A (Maximum).

Output Voltage: 3.5 - 35V DC (This circuit board is a boost board, where the output voltage is greater than or equal to the input voltage).

Output Current: 6A (Maximum).

Output Power: 65W (When the input and output voltages are greater than 20V, it can reach 100W).

Conversion Efficiency: 96% (Maximum).

Output Ripple: 40mV (Typical).

Onboard Voltmeter Range: 4 - 40V with an accuracy of ±0.1V.

Dimensions: 67.5mm × 41.5mm × 14mm or 2.66" × 1.63" × 0.55" (in inches).

There is an onboard voltmeter which can clearly display the input and output voltages. (We can choose to display the input or output voltage by pressing the button on the board.) When the "IN" LED
is lit, the voltmeter shows the input voltage; when the "OUT" LED is lit, the voltmeter shows the output voltage. We can also turn off the voltmeter LED by removing the jumper cap of "P3" (Refer to the figure below).