The Sync Up's deliverance of killer heavy bass results in a higher fidelity sound and an overall fantastic listening experience. Enjoy up to 12 hours of playtime with the included charging case, and never worry about your earbuds falling out again with the secure fit design. With a button on each bud, you can control your music, answer calls, and use voice controls without ever picking up your phone! And thanks to the built-in mic, all your calls will be crystal clear.The Sync Up's deliverance of killer heavy bass results in a higher fidelity sound and an overall fantastic listening experience. Enjoy up to 12 hours of playtime with the included charging case, and never worry about your earbuds falling out again with the secure fit design. With a button on each bud, you can control your music, answer calls, and use voice controls without ever picking up your phone! And thanks to the built-in mic, all your calls will be crystal clear.