LEVEL is capable of extremely high output, up to 10dB (even in clean setting). Useful as a "pre-boost" for additional gain out of your amp without altering any tonal characteristics. 1/4" INPUT is 1megOhm high impedance input, same as traditional tube amps. 1/4" OUTPUT is 1kOhm low impedance output. Can drive long cables without loss of signal integrity, even in bypass. LED is highly efficient and low power consuming. It will fade as the battery runs low (±6.5V), although the Double Drive will continue to operate. Utilizes standard 9V alkaline battery (not included) or optional power supply: Tech 21 Model #DC2. Power Consumption: approx. 5mA.