Main Features:- Made of good quality metal, durable to use.- Volume gain knob is well-designed and user-friendly.- Added with ECHO switch, ECHO time and ECHO depth are designed in high-end control system to meet all high-impedance microphone drive demands.- The 4-channel independent amplifying signal output and 2-channel PreAmp output can be used as the pre-amplifier of high-end microphone.- The interface panel reserves microphone interface in 6.5mm and 3.5mm to 6.5mm gold-plated converter, allowing for the input / output of microphone and loudspeaker box input.- Suitable for all types of impedance earphones. Brand: LINEP Channels: 3 (2.1) Model Number: A908 Special Feature: Mini,Portable,Wireless 0.276 Package weight: 0.315 kg Product Size(L x W x H): 10.50 x 5.80 x 4.80 cm / 4.13 x 2.28 x 1.89 inches Package Size(L x W x H): 15.00 x 7.00 x 6.00 cm / 5.91 x 2.76 x 2.36 inches Package Contents: 1 x LINEP A908 4 Channels Stereo Headphone Loudspeaker Amplifier, 1 x Audio Cable, 2 x Power Adapter