40000mah best mobile power bank 4USB output

?Capacity: 30000mah 3.7V
?Input Micro/Type-C/iPH: DC5V/2.1A(max)
?Output USB1/2/3/4: DC5V/2.1A(max)
?Rated capacity: 40000mah (5V/2,1A)
?Battery type: lithium polymer
?Total battery power: 111Wh

What’s in the box
1 X 40000mah Power Bank
1 X User Manual