Picture caption: aim's AS301 sound adapter has a unique vacuum tube look.

The device features a vacuum tube style design, as shown in the pictures. At first glance the tube looks like it is made of glass-however the device is made with plastic to simulate the look of a vacuum tube. Despite saying “it is a vacuum tube design” on the box, do not be mistaken. The AS301 does not actually have a genuine vacuum inside, it only looks that way.

Specification: size 23 (D) × 45 (H) mm, weight is 12g. The sound chip inside is the "VT1610". Supported OS are Windows 2000/XP/Vista/Mac/Linux. The inside of the tube has a blue light that illuminates the interior when the USB flash plug is used to connect to a computer. Estimated price from online retailer ARC is around 3,000 yen."