It is a professional audio specialty shop in Akihabara.
As this shop mainly handles domestic and international professional audio products and broadcast equipments, they have wide range of peripheral audiovisual and lightning equipments etc.
As there are many small parts as well, you may be able to find everything you need for professional audio products.
Microphone cable and guitar cable are sold in increments of specific length.
Also, There are wide variety of "Gacha" machines(capsule toy machine) in front of the shop.