Archer AA- 10JR portable 15-watt solid-state guitar practice amplifier (commonly manufactured under the model AG-15 by various brands like Sunsmile, RJ Guitars, and generic OEM factories).
The main features:
Audio Controls
Input Jack: A standard 1/4" (6.35mm) audio port to plug in an electric or acoustic-electric guitar.
Gain Control & Overdrive/Boost Switch: Configures the initial input level. The adjacent toggle switch activates a high-gain "distortion" channel for rocky, overdriven tones.
Volume Control: Adjusts the overall output loudness level of the integrated 6.5" speaker.
3-Band Equalizer (EQ): Three separate control knobs dedicated to shaping your frequency response:
Treble: Controls the high-frequency brightness.
Middle: Controls the mid-range presence.
Bass: Controls the low-end punch.