Made in Belgium: Whadda is a unique brand from the Velleman Group of Belgium offering DIY projects for hobbyists or makers who want to delve into electronics, programming, and mechanics. Input Sensitivity: 40mV input sensitivity for good compatibility with various audio devices. Direct current (DC): The amplifier operates with a direct current of 15 V. Low distortion: Low total harmonic distortion of 0.05% results in better sound reproduction. Protection: The amplifier is equipped with thermal and short circuit protection.