This Jawbone UP4 activity tracker is the perfect partner for your fitness journey. With heart rate, calories and distance measurement provided, you can easily track your progress. The sleek and stylish silver cross color and nylon, plastic, and metal material make it a fashionable accessory to wear on your wrist. Enjoy its features including sleep recording, wireless connectivity, Bluetooth, temperature, altimeter, cadence, GPS, pedometer, data review, compass, calorie monitoring, goal setting, rechargeable battery, distance traveled, alarm, average speed, and average heart rate. The UP4 is perfect for gym and training, yoga, running, and other physical activities. With an accelerometer and GPS sensors, your fitness tracking will be accurate and reliable.