Vidonn A6 Bluetooth Fitness Tracker Smart Wristband with Heart Rate Monitor - Purple Super compact light-weight fitness tracker provides real next-to-skin wearing comfort and continuously tracks heart rate, calories burned, floors climbed, active minutes, steps, distance, and sleep quality Equipped with one of the most advanced optical Heart Rate monitor module and algorithm, this activity tracker monitors your heart rate right on your wrist to accurately track workout intensity, maximize training and optimize your health by providing both real-time readings and historical trend of your heart rate Featuring a seamless IP67 water resistant design, the fitness band offers a large OLED screen for an optimal display experience, delivering full caller ID and message notifications from text and social applications including Facebook, Snapchat, Twitter and WhatsApp Bracelet tracker with long battery life stays on for up to 15 days without having to change the battery Supports wireless firmware upgrade for future algorithm update and App enhancement