B-Stock, Audio-Technica ATH-C200BT Black Bluetooth In-Ear Headphones - frequency response 20 - 20,000 Hz, impedance 32 ohms, sound pressure 108.5 dB, battery life up to 9 hours, battery: DC 3.7 V lithium polymer battery, Bluetooth version 4.1, range of up to 10 m, weight: 15g, Color: Black, B-Stock with full warranty, may have traces of use.