Those who like doing some exercise regimes under the surface of water are often caught wanting more. That’s where the Tempo Trainer Pro comes in with all that you would want from a waterproof pace coach. It fits in securely under the swimmers cap and transmits an audible tempo beep. The battery of the trainer can be replaced at will.

What wins it for the Tempo Trainer Pro is the fact that it packs a Sync button and a new mode in strokes and strides per minute measurements. The $50 device also packs a clip and dry land exercise.
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