BOSS GT-1 Multi-Effects Processor Operation confirmed with both batteries and 9V power adapter. Presets have been initialized to factory settings. Used indoors only. No smoking, no pets. No accessories included. I originally preferred compact effects pedals, but I tried this highly-rated unit, but it didn't suit me, so I'm selling it. Multi-functional guitar effects processor equipped with COSM technology - Model: GT-1 - Type: Guitar Effects Processor - Features: COSM technology - Functions: Tuner, Looper, Effect Processor - Controls: Pedal, Switches, Buttons