Schertler Yellow Uno Pre-Amplifier, Preamplifier, High-quality, single-channel Class A preamplifier, Input channel suitable for a large number of microphones and pickups, Volume control, Adjustable warm filter, Mute function, It is possible to activate a 10V voltage at the input to power electret microphones (e.g. the Schertler Stat) or to configure the output as balanced or unbalanced, Power supply either with a 9 or 12 V power supply unit (not included) or a 9 V battery, LEDs indicate operating status and active functions, Matching Schertler PRE-Clip for strap attachment available under Art.#230888# (not included), Made in Switzerland