Brand: 5 Core. MPN: GA 20 BLK. 5 Core Guitar Amplifier Series Features : Function (Front-Panel) 1.INPUT : Standard 1/4 inch jack 2.GAIN : To adjust the pre-amplifier effect level for overdrive channel 3.BOOST : to adjust the preamplifier effect level for BOOST Channel 4.VOLUME : Adjust the level of the master signal 5.TREBLE : It controls the high frequency range 6.MIDDLE : To control the boost and cut of the middle frequencies range 7.BASS : It controls the low frequency range 8.AUX : Auxiliary port for MP3 players, headsets and Microphones 9.PHONE : This is a headphone output jack 10.POWER : ON/OFF switch for main power of the amplifier Technical Specificaton: OUTPUT POWER 20W AC POWER 110V 60HZ OUTPUT IMPEDANCE 4 ohms SPEAKER SIZE 6.5 in. SNR Frequency 70db.  20 watt RMS guitar amplifier with Gain, Boost Treble, Middle, Bass, Volume, Controls; Guitar Amp with 1 x 6.5 inch speaker units; The 6.5mm input allows this amp to be used as an electric guitar amp, bass guitar amp, and electro-acoustic guitar amp.; Controls: Gain, Volume, Treble, Middle, Bass. Aux Input, headphone output for silent practice; Portable and light weight for easy transport. Secured hard corner edges Makes your amplifier stand safe and stable also protects your amplifier from damage and dents; .