Insignia Wireless Bluetooth Headphones - Gray Bluetooth 4.0 interface Allows you to wirelessly link with most Bluetooth 4.0-enabled devices from up to 33' away, so you can enjoy high-quality stereo sound. In-line controls Make it easy to adjust the audio. Built-in microphone Enables clear hands-free communication. Curved design Fits comfortably around your neck. The in-ear design directs sound into your ear canal to promote immersive listening. Rechargeable battery Lets you enjoy up to 12 hours of talk time, up to 10 hours of music and up to 14 days of standby time per full charge.