Sennheiser CX 300 black Extremely small and lightweight. Ear coupling: intraaural, Headphone frequency: 17 - 22000 Hz, Headphone sensitivity: 113 dB. Connectivity technology: Wired, Cable length: 1 m. Weight: 4 g. Package dimensions (WxDxH): 99 x 50 x 216 mm. Cables included: - ear adapter set - cable clip - cable winder - carry case