Develop consistency and avoid lulls with a personal pace coach, the Tempo Trainer Pro. The small, waterproof device easily secures under a swimmer’s cap and transmits an audible tempo beep. Athletes 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... Audible Beep.Loud enough to hear in and out of water AdjustableTempo can be adjusted by 1/100 of a second Replaceable BatteryAllows for an extended life Sync ButtonSynchronize the device to a pace clock or stopwatch 3 Modes Single beep from to 0.20 seconds to 99.99 seconds Triple beep from 1 second to 9:59 minutes Single beep in strokes/strides per minute Perfect for PacingConsistent stroke tempo eliminates lulls in races or workouts Multi SportApplicable for swimming, biking, running and more FloatationUnit floats in water Small Convenient SizeEasily place under swim cap Dryland Clip Included Use the removable clip to secure to clothing