Compatible with the active app for individual settings and evaluation via Bluetooth Smart Battery/charge indicator, battery life of up to 8 days Fastenable wrist strap, comfortable to wear thanks to silicone wrist strap Easy-to-read display for left and right handers Number of steps, distance, calories Have you done enough exercise today activo will let you know! with its chic, slender, two-tone wrist strap, the activo's clearly legible display provides precise information. It shows how many steps you have taken, how far you have moved, and how many calories you have burned. Above all, it shows the activity level of the day and uses Bluetooth Smart to transmit all of the statistics to a Smartphone and the free Sigma Activ app.