What is the BAROMETER city-scheck book?

With the BAROMETER city-scheck book you get vouchers for different restaurants, shops, night clubs, theaters etc. Wirtshaus Zur Brez´n, Sevenfisch, Elly Seidl, 8Seasons, Varieté Theater, Ratskeller München, Käfer´s Delikatessen, Thermenwelt Erding, McDonald´s are some examples. Depending on the voucher you get free drinks or pay one meal instead of two. Check out the BAROMETER website:
http://barometer-group.de/barometer_2010/Das-City-Scheckheft/Muenchen/Willkommen-beim-BAROMETER-2010.html