This is unopened. It is the magenta filter (for green water) for the 60m GoPro Housing for the Hero4, 3+ and 3. Please note this DOES NOT work on a standard GoPro housing. It ONLY works on the GoPro 60 METER housing for the Hero 4, 3+ and 3. I will not take returns on this because you bought it for the wrong housing. YOU ONLY HAVE A 60 METER HOUSING IF YOU BOUGHT THIS OPTIONAL DEEP HOUSING. Price: $22.00 and shipping is free within the United States.