HiFi P6 Tube valve 6N3 Stereo Buffer Preamp preamplifier amplifier Mini kit ,Size:125*75*45cm,it's cool,stereo output PCB Circuit layout is reasonable and beautiful, minimize noise,warm sound,perfact for listen person singing. Best for your desk headphone amplifier or home power amplifier.make the sound more warm. About the input and output interface.all using GOLD RCA interface. Ship by USPS post model from China. usually take 7-10 business days arrival