The module uses high-quality LM2596 chip, with high efficiency (up to 92%), low heat generation, and can carry more than 3A (short time) current This module uses machine mounting and reflow soldering. At the same time, each module has undergone two hours of aging test shipment On board stabilized voltage power supply, just connect the input terminal of this module to the lighter for power supply, and then adjust the potentiometer to supply power for your mobile phone and other devices It can be inserted into the pin through the lead or on the hole board for use; Or directly solder PCB after adding pins. System working voltage test. This module can be used to debug the working voltage range of voltage test Module : non isolated Rectification mode: asynchronous rectification Color: blue black : PCB Input voltage: 3.2V-40V Output voltage: 1.25V-35V Output current: 3A (maximum) Conversion efficiency: 92% (maximum) Switching frequency: 150KHz Output ripple: 30mV (maximum) Load adjustment rate: 0.5% Voltage regulation rate: 2.5% Operating temperature: - 40 to+85 Overall dimension: 43 x 21 x 14 (L x W x H) (mm) Matters needing attention: 1. For long-time operation, it is recommended to use the current within 2.5A and add the heat sink (output above 10W); As it is a step-down module, keep the minimum 1.5V differential pressure to stable output. 2. This module is an adjustable step-down module. The output voltage can be changed by adjusting the blue adjustable resistor on the module. The input and output differential voltage is 2V, and the minimum output voltage is 1.25V. 3. The IN - (negative input), IN+(positive input), OUT - (negative output), OUT+(positive output) marked on the module must be correctly connected, otherwise the module may be damaged. 4. The module has no output short circuit protection. If the output short circuit lasts for a long time, the module may be damaged. Package Contents: 2 Regulator Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.