Little Bear B4-X Portable Dual-Mono Vacuum Tube Headphone Amplifier, Mini Balanced Audio Headphone Amp B4 Upgrade Version!
Get the warm analog sound of a tube amplifier on the go with this portable headphone amp that packs two tiny Raytheon vacuum tubes. Ths palm-sized amp has a built-in rechargeable battery, and connects to your audio source via a 3.5mm input jack.
Mini size and unique design: built-in tube makes you have a tube amplifier which can be held by one hand, convenient to carry and can enjoy HiFi music everywhere.
Full, delicate and soft sound: warmer than transistors, independent op amp and power supply inhance the SNR and degree of separation, less interplay and higher sound quality.