You need to wait until 10 minutes before the show starts to redeem the voucher. Luckily, they already assigned the seat number, so not a left over seat. The audio was not a translation kinda, it’s only a narrative audio play. Well, on my opinion, no need to pay audio since it will only give you information about what it showed. Other than that, the story is not a well-structured story from beginning-climax-ending. It’s only a puppet show which consist of a lot of story about Vietnamese customs, and each stage will might only stays for 2-3 minutes each. It’s just nice to have if you have already in Ha Noi, but won’t be the ‘must to watch’ during your visit in Ha Noi.