Century™ SC 630 USB ML 504552 Century™ SC 630 USB ML is a premium single-sided wired headset for all-day use with Unified Communications and softphones in busy call centres or offices. It features USB connection and in-line call control, and is certified for Skype for Business. Specifications: Colour black Wearing style headband Impedance ~200 ohm Connector USB Frequency response (microphone) 150 Hz – 6,800 Hz Frequency response (headphones) 50 Hz – 18,000 Hz Microphone ultra noise-cancelling Max. sound pressure level 113 dB limited by ActiveGard® Cable length 2.9m Weight 134g Speaker type Neodynium magnet speaker Included in the box: Headset Fixation kit for call control Quick guide Safety guide Leatherette earpad Cable clip mounted on headset Nylon protective pouch