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 to make your for still work while moving, and its design is so smart that you can troubled of a mass wire. MULTIPLE PROTECTION: Support output overcurrent, overvoltage, short circuit protection; input overvoltage, overcharge, overdischarge, overcurrent discharge protection and machine overheat protection. Safe and reliable USE AND NOTE: This product belongs to the power supply device. Please keep it out of the reach of children. install the battery first, then connect the UPS to the for . Please 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 yourself FAST CHARGING SUPPORT: Support , , SFCP fast charge protocol maximum, support 18W protocol, 20W input FUNCTION UPGRADES: Support 4.2V 4.35V 4.4V 4.5V lithium battery, for power supply side current, voltage, power monitoring, Note: Different types of batteries cannot be mixed Colour:Black Material:Plastic Package Contents: 1 * Power Supply Management 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.