This is a no fuss device, hassle free operations has led indicator light to show power remaining in the device . Charging time will vary I use a Lenovo power adapter it roughly takes about 90-120 mins to charge. You can charge any two devices using the power bank. Charging time is faster for devices than using a regular adapter/charger but devices generally tend to heat up a bit. Built quality is good with metal finish. I bought the product from Croma which came in sealed hologram packing with proper invoice and warranty.