Last year, lots of A-Mao’s Japanese customers complained that most of their houses was so narrow that the fan in Ultracker’s DVR was too noisy, and it was so hard to deal with then. How about buying a huge house? Thanks to Ultracker’s smart engineers for that now fan speed can be adjusted, and then there is no grumble from customers. However, the quieter the fan, the higher the temperature. It shall decrease the life of HDD. Well, you cannot sell the cow and drink the milk.