NGS MSX4 Pro V2. Device connectivity: Wired, Device interface: 3.5 mm. Ear coupling: supraaural, Acoustic system: clip-on, Headphone frequency: 20 - 20000 Hz. Microphone sensitivity: -58 dB. Package dimensions (WxDxH): 210 x 60 x 255 mm, Package weight: 200 g