Smart Charge Technology3 output ports, each port has a built-in smart IC and auto-resume charging function, which can recognize your device smartly and maximize the charging efficiency. It also has a built-in protection system to ensure the charging safety of solar chargers and devices.One-piece Lamination Technology, ETFE Material 40W solar charger adopts advanced one-piece lamination technology, using monocrystalline solar cells covered with highly transparent ETFE material, the solar energy conversion rate reaches 24%. ETFE is extremely durable, corrosion resistance, and flame retardancy, which is double life-span compared to other PET solar panels.IP68 Waterproof/Dustproof/DurabilityThe high-density ETFE surface makes it highly waterproof/fireproof/dustproof, which is definitely recommended for outdoor activities such as hiking and camping. IP68 waterproof level, protect your solar powered charger and your devices from occasional rain or wet fog, but keep it away from water when you have some devices on charge.Wider Compatibilitywith 3 ports, DC (18V, 2.2A), USB-C PD 30W and USB-A. 40W folding solar panel meets all your charging needs. It capable to charge small power stations, smartphones, power banks, laptops, camping lights, MP4, GPS, Bluetooth headset, headlamp etc. under enough sunlight.Highly Compact/LightweightCompact size (21.432.14cm folded), only 1.35kg, 20% lighter than other 40W solar panels, and ultra-thin design (0.2cm opened), make it ideal for outdoor activities and long treks.