Wireless Sport earphones with secure fit in-ear clips driver diameter: 10 mmCall/redial/volume control with Bluetooth enabled devices rechargeable li-ion battery provides up to 3 hours of play timeFrequency range: 20 20, 000 Hz sensitivity: 110 +/- 3 dBImpedance: 16 ohms Bluetooth 4.2Power: Rechargeable battery (70 mAh) accessories included: stereo earphones, charge cable Color:RedPerformance Bluetooth wireless sport earphones listen to your favorite music in high-quality audio with naxa';s performance Bluetooth wireless sport earphones (ne-960). built with an over-the ear hook design, these convenient earphones are held securely while you're performing or exercising. The dynamic 10 mm neodymium drivers help to ensure that you enjoy a crystal-clear audio experience. The built-in li-ion battery provides you 3 hours of ample listening time for each full charge.The included buttons allow you the option to call, redial, or control the volume when used with Bluetooth-enabled devices.