50w solar panel kit solar- controller 4*3 monocrystalline charge

2.environment-friendly and pollution- it realizes the energy conversion from solar power to electric power 3. wide range of applications, it can be used in lots of place such as for car, small household appliances, ect. 4.a solar panel is a device that converts solar radiation directly or indirectly into electrical energy by absorbing sunlight. compared with ordinary batteries and rechargeable batteries, solar panels are more energy-saving and environmentally friendly.