Crisp, Clear Audio with Error Correction Built-in audio correction technology minimizes distortion and ensures crystal-clear sound for calls and music. Bluetooth 4.0 Quick Pairing Instantly connect to your smartphone, tablet, or laptop with stable wireless performance and automatic reconnection. All-Day Battery Life Get up to 4 hours of continuous playback or 7 days of standby time with the included charging box for convenient recharging. | Cluzine | | Clear Top Dual Chamber Wireless Bluetooth Earphones with Charging Box | Metallic | Best Buy