Welcome to my store, I hope you have a great shopping experience here. We will keep updating a lot of new products, and there is definitely one for you. Conversion Efficiency: 92% (Highest) Switching Frequency: 150KHz Input Voltage Range: DC 2.5V - 40V Output Current (Max.): 3A Size: 6.6cm x 3.6cm x 1.4cm/2.60" x 1.42" x 0.55" (Approx.) Voltmeter Range: 0 to 40V, error +- 0.1V Green LED: Testing Output Voltage Type: Step-down Power Converter Module Output Ripple: <30mV Red LED: Testing Input Voltage Working Temperature: -45 &#x2103; to +85 &#x2103; Output Voltage Range: DC 1.25V - 37V Quantity: 1Pc Specifications: Built in output short protection function. LED digital voltmeter tube, the accuracy is adjustable function, can be aimed at your multimeter adjustable accurate. Press the right key to let the display show the input or output voltage. When the right" OUT" led light, it shows output, the left "in" led show input. Input reverse polarity protection. Built in thermal shut down function. Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Step-down Power Converter Module