Start getting credit for your daily activity with the Timex IRONMAN Move x20 Full-Size fitness tracker. It works seamlessly with your iOS or Android smartphone to provide an incredibly convenient way for you to track your steps, distance and calories. There's also a workout mode that displays your elapsed time and pace. It holds 30 days of daily data, 30 workout files and 10 days of sleep data. With easy-to-read, illuminated characters, you'll always be able to check your progress. All day activity monitor features 3D accelerometer technology. Tracks and displays steps, distance, calories, time of day and date. Records total sleep time and the hours/minutes of light sleep and deep sleep. Workout mode features tracking of elapsed time, distance, pace, calorie expenditure and steps. Connects with free Timex phone app to display caller ID and texts. Vibration alert for discrete wake up (in app, sleep mode must be set to Auto" and wake up time entered). Find phone feature activates audible alert on Smartphone. Progress bar illustrates where you are in reference to goal settings (steps, distance and calories). Features goal completion alerts. Delivers a low battery alert at 10% battery. Rechargeable Li-ion battery, 7 days typical battery life. Protected against splashing water.