Product description NFC modules THD+N< 0.00006 % Full aluminum case 3.5 / 4.4 mm Headphone Jack 12V Trigger Perfect partner-D50iii Front and back panel How to use Size and Accessories Parameter 1 Parameter 2 For most of Headphone 3500mWx2 Power Out FFT Spectrum 6.35 mm Out FFT Spectrum 4.4 mm Out Mutitone 6.35 mm Out SNR @G=M 4.4 mm Out DNR @G=M 4.4 mm Out