Standard Pi-HAT size, compatible with all expansion boards, stacked design, saves space, powers and expansion board at the same time, does not affect GPIO expansion Supports maximum 2A fast charging technology, can charge in a shorter time and use for a longer time; Supports charging and discharging at the same time; can power while charging, with protection circuit to prevent overcharging and over-discharging With 4 LED power indicator lights, it is convenient to observe the current battery power in real time; It is convenient to display the current power in your Supports removable batteries, which is convenient for users to choose larger capacity lithium battery packs according to their needs (voltage must be 3.7V) Name:Lithium Battery Expansion Board Applicable:for 3B+ Colour:As Shown Material:PCB Package Contents: 1 * Expansion Board Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.