Features: Brand new and high quality Supports a bi-directional quick charge, supports quick charge protocols. Lithium battery protection circuitry, provides reverse protection, overcharge/discharge protection, overcurrent protection, and short circuit protection. Can be used as a universal mini power bank, also works with other 5V devices. Made of high-quality materials, exquisite workmanship, very good quality and long service life. his product is very easy to install, no additional tools are needed, and the installation process is very convenient. Specifications: Material:PCB Size:Approx.85x30mm/3.34x1.18inches Package Includes: 1x Expansion Board note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.