"Used - Excellent Condition (Grade A) - The item is in a pristine, like-new condition. It is fully functional and has been professionally inspected and cleaned. The item may not come with its original packaging and contains all OEM accessories. Package Includes: Charging case, mini USB to USB charging cable, Basic user manual, 3 pairs of CP350 silicon ear tips (S/M/L), 1 pair of CP100Z silicon ear tips (SS), 3 pairs of ear wings (S/M/L) Specifications Impedance: 16Ohm Microphone sensitivity: -42dB +/-3dB Frequency response: 20Hz - 20kHz Sensitivity: 95dB +/-3dB at 1KHz Driver type: 5.6mm Number of drivers: 2 Battery life: 4 hours (earbuds), Up to 16 hours with charging casehrs Charge time: 15min quick charge for one hour of listening (earbuds + charging case), 2 hours (earbuds), 3 hours (charging case)hrs"