ABY pedal. Dual mode capability. Mode 1 - signal path flows from A/B to Y. Mode 2 - signal path flows from Y to A/B. Works without power (LED indicator stays dark). Simple, easy to use design. 100% Analog design with True Bypass circuitry. 100% Analog design with True Bypass circuitry. "Effects on" indicator light. Micro pedal package - very small and compact.