Featuring Skull-iQ Smart Technology. Skull-iQ is a powerful technology that runs innovative voice features and enables new upgrades via the Skullcandy App. Rail's upgradability offers the promise of new and innovative features. Simplify your listening with Hands-Free Voice Control, Customizable button functions, Spotify Tap, take photos, multipoint pairing, Auto On/Off, and Activate Assistant. Up to 34 hours of total battery (10 in the bud, 24 in case), Rapid Charge, Built-in Tile Finding technology, and IP55 sweat, water and dust resistant.