Blackstar’s patented ISF control allows you to choose the exact tonal signature you prefer. At the lowest setting, the amplifier has a more American characteristic with a tight bottom-end and more aggressive middle, and at the higher setting the amplifier has a British characteristic which is more ‘woody’ and less aggressive. Features: Channels: Clean, Crunch & Lead Effects: 3x Reverb, 3x Delay & 3x Modulation Tap Tempo: Yes (effects) Connections: Guitar (in), aux (in), headphones/line (out) Controls: Gain, ISF, Volume, Effects/Tap Tempo Foldable Jack: Yes Power: AAA batteries (not included) Specifications: Dimensions: H:8.0 x W:8.0 x D:3.1 cm Colour: Black Guarantee:1 year Batteries Required: Yes Material: Plastic Model Number: BA154100-H