The flagship TANK T4 and TANK M4 have been designed with watersports firmly in mind. Rated to 10ATM and IP69K standards, they support swimming, watersports and recreational diving to a maximum depth of 45m (148ft).

Both models feature an integrated recreational dive computer using the Bühlmann ZHL-16C decompression algorithm, with support for air and nitrox diving as well as dedicated scuba, freediving and gauge modes.

During a dive, they provide the standard information recreational divers would expect, including no-decompression limits, ascent-rate monitoring and safety-stop guidance, while logging each dive for later review through KOSPET’s APEXMOVE app.

Both models have been independently certified by SGS to meet the US MIL-STD-810H military standard, having undergone testing for impact resistance, salt spray, humidity, thermal shock and temperatures ranging from -50°C to 70°C.

The TANK M4 combines its rugged construction with a large 1.96-inch AMOLED display protected by Corning Gorilla Glass 3, providing a bright, easy-to-read screen underwater, while four physical buttons offer an alternative to the touchscreen when wearing gloves or operating beneath the surface.