LB1 High Performance 28W Foldable Solar Charger with High Efficient Monocrystalline Panels (15-18V) Ultra Fast USB Charging (2.1A) for Lenovo ThinkPad 8 28 Watts 18V High Efficient Mono-Crystaline Foldable Solar Charging Panels SMART CHARGING TECHNOLOGY Solar recharger can detect what type of device you've plugged in so cell phones, tablets, laptops, gaming systems, GPS devices, digital cameras and other devices all recharge as safely and quickly as possible. WON'T WEIGH YOU DOWN! Most compact 28watt charger on the market with just 4 high efficiency monocrystalline solar panels; Only measures 9.25" x 11.375" x 1.75" to fit into your backpack with ease. EXPAND YOUR CHARGING POSSIBILITIES Daisy chain up to three of these solar chargers for up to 84 Watts of charging capability; Use with the PB160 generator, and you can store power to recharge at night and in emergencies when there's no sun available. SATISFACTION GUARANTEED Get everything you need to recharge your devices with nothing but the power of the sun! It's all backed by an 18-month warranty, so you can buy with confidence.