Circuit design of this PSU box is linear DC power supply, which is not switching power. It works reliable, with lower ripple and low noise, it provides clear power supply, for Hifi home audio use.
(It is compatible and it is good for Raspberry pi 4, package includes type C cable for pi 4, you can plug and connect directly.)

Specification:
Item model: SOLUPEAK U2
Input voltage: 115V AC

Output voltage: 5~5.1V DC , 3.5AMP(max/total)

Output port: USB and 5.5/2.5mm DC
(Please confirm the requirement voltage and current of your device in advance before ordering. It can not working full load all the time or overload. Such as when you connect with one pi 4, please do not connect with another device at the same time.)
Product case external dimensions: 143*97*50 mm
Item Weight: 0.8KG
Package weight:1.2KG
Packing List：
U2 box x1
AC cable x1
1 meter DC to DC cable(5.5/2.5mm) x1
1 meter USB to type-C cable x1