SONY Wireless Stereo Headset WI-C400

Usage : Wireless In-Ear Neckband Headphones for casual and daily usage. Frequency response: 8 Hz-22,000 Hz. Inline Remote : Yes Battery Life : Up to 20 Hours of battery life, Charge Time : Approx. 4.5 hrs Behind the Neck Style Headphones : Comfortable behind-the-neck style with cable management