Joyo JF-309 Boogie Master Electric Guitar Single Effect Controls: Tone Gain Mid Boost Volume Specifications: True By Pass Input Impedance: 1m Output Impedance: 10k Running Current: 25mA Power: DC 9V negative polarity adapter, not supplied Plug in 9v DC Adapter (not included) JF-309 Boogie Master, NEW mini Guitar effects pedals from JOYO.