Transistor/solid-state design electric and acoustic guitar combo with Bluetooth 5.1 and built-in rechargeable 3.7V/3000 mAh lithium battery. Playback from external sound sources via Bluetooth or AUX input, runs up to 6 hours per battery charge. 2 selectable sound modes: Clean/Overdrive, controls for Bluetooth/Aux Volume, Gain, Tone, Volume, switches for Bluetooth On/Off, Clean/Drive. NOTE: A 6-month warranty is provided for the batteries built into the devices. This warranty covers defects due to faulty materials or workmanship that occur during normal use.