Features: brand new and high quality Can be used for DIY production of solar-charged LED lights, solar street lights, lighting fixtures, etc. Default we have set the holding voltage for MPPT. So we have 3 version for the input voltage 6V/9V/12V(for Solar Panel working voltage 6V/9V/12V), very suitable for the application of the input voltage and battery voltage difference is bigger. Solar maximum power point tracking (MPPT) is to ensure that the light intensity change, photovoltaic cells output maximum power, to make full use of solar energy. In general, need to use a switch mode for DC - for DC converter to realize MPPT function, keep the output voltage and charging current product maximize (output). The output of the Solar Charger is intended to charge a single polymer lithium ion cell. The load should be connected in parallel with the battery. Each Solar Charger comes equipped with a CN3791 power tracking battery charging circuit and pre-installed four 2-pin JST/PH2.0 connectors. This is a maximum power point tracking (MPPT) solar charger for single-cell LiPo batteries. This MPPT solar charger provide you with the ability to get the most possible power out of your solar panel or other photovoltaic device and into a rechargable LiPo battery. Specifications: Material:Metal Input voltage: 6V/9V/12V Working environment temperature: -40°C-85°c PWM switching frequency: 300KHz Constant voltage charging voltage: 4.2V ± 1% Size:Approx.45.25x20.6mm/1.8x0.for 81 inches Package Includes: 1x Solar Panel note: 1.Please allow 1-2cm errors due to manual measurement,pls make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.