A great gift! Track your steps, distance traveled, and calories burned with the Vivitar Wireless Activity Tracker. Track your daily, weekly, monthly progress via the mobile app.This tracker contains a sweatproof band. The trackers is compatible with most iOS and Android smartphones and tablets. Battery lasts up to 30 days on a full charge. Battery life will vary depending on the product configuration, product model, applications loaded on the product, power-management setting of the product, and the product features used by the customer.