Compact Design: Boost Step-up Module - 20 pcs, Size: 0.2 x 0.6 inches (6 x 17 x 14 mm), Weight: Approx. 0.1 oz (4 g), Lightweight, compact and easy to carry. [Adjustment] Potentiometer will turn into a reverse clock when facing the chest. Some customers cant adjust the output voltage of the module and always reflect the input voltage. If you encounter such problems, please follow the following steps. Rotate the potentiometer counterclockwise at least 10 rotations. Then you can adjust the voltage normally by using the module. This allows the voltage adjustment to work normally, and the output voltage can be adjusted to the desired level. Easy to use: Micro USB input compatible, output current 2A, input voltage 2V - 24V, output voltage 5V - 28V, efficiency > 93% module. Note: 1. The input voltage should not exceed the large input voltage. 2. Peak current output should not exceed 2A max. Following these precautions will help you use the Boost Converter correctly and securely. Protecting the input voltage and output current restrictions is important to reduce the risk of damage to equipment and circuit and accidents. Please refer to the product specifications and instruction manual when using. 【Convenient Mini Size】Boost Converter - Pack of 20, compact and portable size, lightweight design of about 0.2 oz (4 g). Perfect tool for experiments, electronic design, DIY and more.