Develop consistency and avoid lulls with a personal pace coach, the Tempo Trainer Pro. The small, waterproof device easily secures under a swimmers cap and transmits an audible tempo beep. Swimmers use the beep to train smarter and discover their perfect pace. Now with the option to replace the battery, the Tempo Trainer Pro will last multiple lifetimes. The advanced unit also has a new Sync button and a new mode in strokes/strides per minute for increased functionality. The Tempo Trainer Pro includes a clip for dry land exercise. FEATURES & BENEFITS Audible BeepLoud enough to hear in and out of the water AdjustableTempo adjustable by 1/100 of a second Perfect for PacingConsistent stroke tempo eliminates lulls in races or workouts Multiple SportsApplicable for swimming, biking, running and more Small Convenient SizeEasily secures beneath a swim cap or goggles Sonic WeldingWaterproof Auto Shut Off FeatureSaves battery life