BOSS GT-1 effects processor equipped with COSM technology, compact and multifunctional. - Model Name: GT-1 - Brand: BOSS - Accessories: Box, CTL1 switch - Color: Black - Function: Effects processor - COSM Technology: Equipped Thank you for viewing. I purchased this last year, but I'm selling it because I haven't used it much. I've used it about 10 times, but I no longer use it. Operation confirmed. Please understand that this is a used item. I will also include a BOSS AC adapter 9V1A, which I purchased separately.