The Joyo DC-15S is a new version of the amplifier that has been known on the market for many years - the DC15. The S model has been upgraded with a built-in battery, Bluetooth® and loop. Specification: Power supply: 100-240V, 50-60Hz Power supply: DC15V, 4A Built-in battery: 11.1V / 4.4AhRMS power: 15W Line output impedance: 1k Ohm Headphone output impedance: 32 Ohm Speaker: 5.25" / 4 Ohm / 20W Subwoofer: 2.5" / 8 Ohm / 15W Bluetooth®: 4.0 Looper: 30 seconds 9 amp simulations: Acoustic, JC Clean, Clean, Overdrive, Blues, Crunch, Lead, Rhythm, Metal 6 digital effects: Chorus, Flanger, Phaser, Tremolo, Delay, Reverb Integrated Drum Machine: 36 Rhythm Patterns Controls: Gain, Tone, Volume (for amp), Space Effects, Modulation Effect, Amp Select, Amp Preset, Bluetooth, Looper, Drum Volume, Drum Style, Tap Tempo Guitar Inputs: 6.35 mm jack AUX input: 6.35 mm jack Headphone output: 6.35 mm jack Weight: 4.2 kg Dimensions: 25 x 19 x 23 cm