The Usil 8000Mah Solar Power Bank is a version (safety standard with many improvements, certificate expired) of a durable solar charging power bank. Leave it by a window in the office or clip it onto your bag on a hike to keep it charged and ready when you need it. It comes with an improved 5-line solar panel design for a 40% efficiency improvement over older models! The design is also anti-shock and water resistant, making it a perfect adventure companion! 2 USB output, Micro Input, 8000mah *Dual charge with solar and traditional *Includes a micro USB charging cable, Carabiner, a user’s guide *Eco-Friendly Specifications: standard Micro Input: 5V/2A 2 USB outputs: 5 V/2.1A (max) Capacity: 8000mAh