Wearing this type of bluetooth ear buds you can pick up your phone or listen music when you are walking, racing, jogging, traveling, or during any other outdoor event. The ear buds support bluetooth function, you can pair two digital devices in the meantime. Lithium battery installed. 3 Hours calling time and 10m bluetooth distance. Great for sports, offices, meetings, camping, travel, clubs, colleges, and trade shows as a promotional gift with your custom logo imprint.