No electricity bill all year round: solar charging can use an automatic switch, no external power supply, no manual intervention, only 0 kWh of electricity per year, and you have no more to worry about bills electricity. Design, with water line sealing, effectively prevent rainwater from infiltrating IP65 outdoor waterproof and moisture-proof: waterproof and moisture-proof, durable. Makes life longer and more durable. Fast-charging polycrystalline silicon panel: solar-powered polycrystalline silicon with fast charging, energy saving, energy saving, dustproof, lightning protection, corrosion resistance. Multi-purpose: install in direct sunlight such as outdoor, garden, balcony, exterior wall, stairs, etc. Sunlight releases electricity and stores it. At night, it plays the role of lighting and street lamps. Very energy saving and environmental protection. Solar energy is the main energy source of the future. Product size: excluding notebook diameter 11 x height 16.6cm