Main Features:GBtiger 21W Solar Charger Panel Power Emergency Folding Charging Bag- Especially suitable for emergency occasions when you work or travel in the wild or power-cut occurredHigh Energy Conversion Efficiency- Adopted sunpower panels, increasing conversion efficiency up to 23pct which is much higher than common solar panel charger ( 15pct )Dual USB Outputs Design- Enabled to transmit power to 2 devices simultaneously, just for your great convenienceWater Resistant Material- High-quality PET solar panels, anti-wear and water resistant, durable to use, long lifespanThoughtful and Convenient Design- With two hooks, enable easily attach to backpacks for hiking camping and other outdoor activitiesFoldable Design- Easy to be folded to the size of magazine, can be put in your bag, easy to carry around Environmentally-friendly- Where there is light, there is electricity, energy-efficient design, conform to the intention of protecting our earthMultiple Protections- The product has passed the CE certification, protection for overcharge, overvoltage, overcurrent and short circuit- No built-in battery, don't worry about the security problems caused by heat and strong lightHigh Compatibility- Suitable for most of 5V mobile devices, like phone, tablet, MP3, MP4, camera, PSP, GPS, etc. Parameters:Model: HYD - 03Solar panels peak power: 21WOutput: 5V 3.2A ( max )Solar energy conversion rate: 23pctOutput interface: 2 USBPanel: 3pcsHow to use: - Place the solar charger under strong sunlight ( such as 9:00 am to 17:00 pm, different countries have different effective illumination time )- Angle solar panels toward sunlight vertical direction, which makes devices get the maximum conversion efficiency of solar energy- Sunlight intensity has a significant impact on the product's output power and current- Do not cover the solar panels 0.561 Package weight: 0.613 kg Package Size(L x W x H): 34.00 x 17.00 x 4.50 cm / 13.39 x 6.69 x 1.77 inches Package Contents: 1 x Portable Solar Charger Pack, 2 x Attached Hook, 1 x English User Manual