Brand: NOKIA Model: E3101 Color: Black/White/Blue(optional) BT version: V5.1 Material: ABS+PC Supported BT protocol: HSP, HFP, A2DP, AVRCP Frequency response: 20Hz-20KHz Codec: SBC Battery capacity: 40mAh(single earbud), 350mAh(charging case) Earbud size: 3.09 * 2.01 * 1.79cm /1.22 * 0.79 * 0.7in Charging case size: 5.02 * 4.41 * 2.3cm /1.98 * 1.74 * 0.91in