INTELLIGENT DESIGN: UPS for 4B / 3B+ / 3B. Built-in power path management, support side-loading, load high current line compensation function. There are two USB A port power output, and also adds type C output. It provides uninterruptible power for the to make your still work while moving, and design is so smart that you can rid of troubled of a wire.You can check the link in the Product guides and documents at the bottom of the page.MULTIPLE PROTECTION: Support output overcurrent, overvoltage, short circuit protection; input overvoltage, overcharge, overdischarge, overcurrent discharge protection and machine overheat protection. Safe and USE AND NOTE: This product belongs to the power supply device. keep it out of the reach of children. strictly refer to the instructions for the UPS product, install the battery first, then connect the UPS to the . do not reverse the battery. If the battery polarity is reversed, it will directly burn the power management chip of the device. Do not add any Components by yourselfFAST CHARGING SUPPORT: Support , , SFCP fast charge protocol maximum, support 18W protocol, 20W inputFUNCTION UPGRADES: Support 4.2V 4.35V 4.4V 4.5V lithium battery, power supply side current, voltage, power monitoring, Note: Different types of batteries cannot be mixedMaterial:Plastic + Metalcolour:blackPackage Contents:1 set x Expansion BoardOnly the above package content, other products are not included.Note: Light 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.