The Fitbit Alta Fitness Wristband Model FB406 in size M and color purple is a new and sealed activity tracker perfect for indoor and outdoor workouts. With a battery life of up to 5 days, this wristband provides heart rate and time measurements using its accelerometer sensor. Compatible with both iOS and Android operating systems, it is designed for unisex adults who enjoy activities such as running and jogging. The plastic material and wristband design make it a stylish and practical choice for fitness enthusiasts looking to track their progress accurately.