Color: Black - Material: ABS + rubber - Screen size: 1.5'' - Battery: 1 x 2032 (included) - When you first open calorie watch and begin to set the data and time you will also set your age weight and sex. This information is stored in the watch's memory. When you begin exercising. You simply start the watch's internal counter. When you are finished you simply stop the counter Press SET and touch the sensor once. Its that easy. Based on your preset information the time on the counter and your heart rate. The calorie watch is able to determine how many calories you have burned during your workout. - Calorie watch also contains these features: - Time and calendar - Daily alarm and hourly chime - Chronograph with split lap time - Exercise counter with automatic and manual override calorie counter - Pulse mode for determining heart rate at any time - Pulse mode: - Press the mode button until you see the word "pulse" at the top of the screen and the small "heart" icon in the upper left band corner - Press and hold the SET button for 2 seconds until you hear "beep" and the words "Touch" - Lightly touch the pad of your finger (the center of "finger-print" area) to the sensor and hold until pulse read out is