Volume controller. Model PC100USB-HR2 is a desktop type of volume controller with built-in USB/DAC that comply with 24 bit 96 kHz high resolution audio playback. The ideal tool for controlling the audio level of your PC when using a powered speaker system such as Fostex speakers PM0.1, PM0.3(d) etc. No external power is required as it works with USB buss power. No need to install extra driver software both on PC and Mac. Works right out of box with the supplied USB and RCA pin cable. Dimensions: 66 x 44 x 70 mm. Weight: 200 g.