Skull-iQ Smart Feature Technology - Activate hands-free voice control or other voice assistants like Alexa by downloading the Skull-iQ App. Worry-Free Wireless - We included Tile Finding Technology to make it easy to track down either earbuds if you ever misplace one. Just download the Tile App and simply 'ring' for your buds. Loaded with Features - Grind is packed with sweet features, including Personal Sound and Adjustable Stay-Aware Mode to enhance your listening experience. 40 Hours of Power - Grind boasts a whopping 40 hours of total battery life. Plus, find out how much battery is left every time you remove your earbuds from the case.