Marfam Print's Bamboo Power Bank is not only sustainable and handy, it's also long-lasting! This power bank is made of natural bamboo, with a powerful 4000 mAh lithium polymer battery inside. With a USB, micro USB AND USB-c port, no device is left behind when it comes to the Bamboo Power Bank 4000 mAh. The indicator lights add to the design and tell you how much juice is left in your power bank.