Same with the K100 but smd for smaller dimensions but also for those who want to start dealing with smd materials. Due to its low supply voltage and low consumption, this amplifier can be powered by two 2AA batteries or by USB. Due to its features and small size it is ideal for mobile devices, MP3, tablet, laptop, mobile phones, voice boards, etc. The board will be assembled and tested for proper operation. It will not be placed in a box.