Magnetic power switch, Finger Activated Soft Start Trigger Waterproof Design. 2 speed adjustments, Machine run time: Approximately 40mins -1 hour (depending on speed settings). This product is very light and can be grasped with one hand, which makes it easy for you to enjoy underwater activities. Fully waterproof and maintenance-free design. 300 Watts DC Electric Motor for great speed. Buoyancy can be adjusted for use on the surface or depths down to 30 meters. Contains a self-filling ballast hull to achieve neutral buoyancy almost instantly.