Little Bear Mini P14 Audio 4 Channel Stereo Headphone headset amp Amplifier Two input modes and switch freely: users can choose 3.5mm jack or RCA jack input, and can switch between the two modes freely by 3.5/RCA selector Double volume control and one mute button: with 4 independent volume controls, 4 users can enjoy the same sound source but with different volumes at the same time. Better shielding design: adopting 3 layers of PCB, it performs well in shielding interference and offers clear sound for each channel With 4 independent Op Amp(NE5532): each channel equips with its own op amp so users can change or upgrade it according to his requirements for sound characteristics Attractive appearance design: 2 colors for users to choose, and with its mini size and light weight, users can carry it everywhere and easily achieve sound sharing