Specification: _x005f_x000D_ Origin: Mainland China _x005f_x000D_ Product weight: 5g _x005f_x000D_ Product size: About 35x35x5mm/1.37x1.37x0.19inch _x005f_x000D_ _x005f_x000D_ _x005f_x000D_ Note: _x005f_x000D_ Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! _x005f_x000D_ Please allow 1-2cm measuring deviation due to manual measurement. _x005f_x000D_ _x005f_x000D_ _x005f_x000D_ _x005f_x000D_ Included: _x005f_x000D_ 1 x Battery Charger Module 1. Green and Sustainable: Harness the power of our professional USB/solar-powered lithium-ion polymer battery charging board to make your project eco-friendly this summer! With a unique design that is perfect for outdoor projects or DIY iPod chargers, our charger has been tested and improved for more than a year to ensure satisfaction. 2. Easy to Use: Choose any one of our numerous 3.7V/4.2V lithium-ion batteries or 6V solar panels. Insert the battery into the BATT port using the 2-pin JST cable and the solar panel into the DC jack using the 2.1mm adapter cable. Put the solar panel outside (and keep the battery cool away from sunlight!) to start the charging process. You can connect it to the LOAD output port. 3. Efficient Solar Charging: Our carefully designed charger is specifically made for solar charging, automatically drawing as much current as possible from the panel under any light conditions. Although it may not be a "true" MPPT (maximum power point tracker), it performs almost as well without the added cost of a buck converter. Other batteries may have different voltages, chemical properties, polarity, or lead-out wires. 4. Complete Kit: The charger comes with an assembled charging board and a large stabilizing capacitor that must be installed in your finished project. Lipoly batteries or solar panels are not included, but we have plenty available in our store that work great. We've updated the design to make it more compact and have better mounting holes.