The Hamburg CARD allows you to use all buses and trains and also gives you reduced admission to many tourist attractions.
The Hamburg CARD is valid for fare rings Hamburg AB, which includes the city of Hamburg and several surrounding towns and districts.

A Single Ticket is valid for 1 adult and up to 3 children (aged 6-14), a Group Ticket for 5 persons of any age.
Validity expires at 6 am on the morning following the last day it is valid for.