Features: High-quality all-tube guitar amplifier head with ECC83(12AX7) EL84(6BQ5) tubes. 5 watts power output, and sounds extraordinary nearly to classic england style. With 2 toggle switches for selecting tone(THIN/ MELLOW) and channel(NORMAL/ TOP BOOST). With VOLUME and GAIN control knobs, and one LED light for indicating working status. With 8O/16O selector for choosing the output impedance corresponding to the speaker. Compact size design and full metal construction, very portable and durable. Tone: THIN-- A bit more bright and shining sound MELLOW-- A little plump and fat sound Channel: NORMAL-- Basic characteristic sound of Little Monster AC TOP BOOST-- More gain will be obtained in this channel and the high band frequency will be increased a little bit