Around rubber ring for sealing effect.  This case can be used for diving, surfing, snorkeling, skiing, yacht or other activities.Specification:Compatible with: GoPro Hero 4 SessionBrand: OzoneType : Li-ionCapacity: 1050mAInput: 5V 1000MAOutput: 3.7V 1050MA    1080P/24FPSPackage Includes:1 x

Around rubber ring for sealing effect.  This case can be used for diving, surfing, snorkeling, skiing, yacht or other activities.Specification:Compatible with: GoPro Hero 4 SessionBrand: OzoneType : Li-ionCapacity: 1050mAInput: 5V 1000MAOutput: 3.7V 1050MA    1080P/24FPSPackage Includes:1 x Waterproof Case1 x Backpack External Battery1 x USB CablePlease note that Gopro Hero 4 Session Camera Not included.