This used RV-5 is in excellent working order.
The Boss RV-5 Digital Reverb gives you six high-quality reverb modes on a par with rackmount processors costing many times as much. First-of-its-kind Modulate mode detunes the reverb sound for added spaciousness. Spring reverb emulation offers realistic spring reverb sounds. Gate reverb taken from high-end Roland studio gear. Level, tone, time, and mode controls.