The RockBoard ISO Power Block V16 is a multi-power supply for effects pedals with 16 isolated transformers and highly filtered power slots, designed for powering up to 15 effects pedals simultaneously without any noise and charging USB devices. The advanced filtering technology used in each of the power slots prevents high frequency noise. Built with individual slot short circuit protection, connected effects pedals are protected in case of a short circuit. With a designated LED for each power slot indicating the slot is working correctly, you can quickly identify any problems without losing power to the rest of your rig.