The Talking Dumbbells from Everlast For Her have a computer in them to keep track of your number of repetitions, lifts per minute, amount of calories burned during your session, and the total session time. The computerized voice also counts your reps while you workout, helping you to stay focused and be more productive. This is a great tool to help you have a better, more effective exercise session. The Talking Dumbbells can be quickly filled with up to four pounds of water and are easy to transport.