If you are looking to elevate your swim training and maximize your performance in all 4 of the strokes used in swim competition then the Tempo Trainer by Finis is what you need. Attach the waterproof unit to your swim goggle or swim cap to transmit an audible beep which acts as a cue to help develop consistant stroke rates and cycles, it also helps to distinguish between optimal training and race pace. The audible cue can be adjusted from 0.10 seconds to 10 minutes and because the unit is waterproofed because of sonic welding, it can be completely submersed. It is sweat proof and spalsh proof which makes it suitable and ideal for swimming, cycling and running workouts. The unit can also be clipped to a shirt, hemet and even a headband or hat.