The Fitbit ZIP FB301B Wireless Activity Tracker Clip Wristband in Blue is a versatile fitness technology device designed for maximum convenience and accuracy. With a battery life of up to 6 months and measurement options in both decimal and imperial systems, this activity tracker is suitable for both indoor and outdoor activities. Its features include Bluetooth connectivity, alarm notifications, cadence tracking, and calorie monitoring, all displayed on a sleek clock interface. Perfect for gym training, walking, yoga, pilates, and general fitness, this Fitbit model is one size fits all and suitable for unisex adults.