Little Bear B4-X Portable Tube Headphone Amplifier w/ order upgraded V5i chips op amps

Product Name: Little Bear B4-X Portable Tube Headphone Amplifier w/ order upgraded V5i chips op amps
True tube sound in a portable amp. Op-amp upgraded to V5i chips (see pic 3). Improves power supply, enhances the SNR and degree of separation, less interplay and higher sound quality. Full, delicate and soft sound: warm, excellent resolution and overall transparent. B4-X adopts 2 groups of independent dual op amp parallel output with higher output power, power supply (+12V and -12V). Can drive 300Ω headphones. order Has 3.5mm single ended and 2.5mm balanced output. Comes with charger and 3.5mm to 3.5mm cable. B4-X retails for $109, the op amp upgrade is $100, total package $209.