The Plastronics CS520 vver-the-head binaural headset features streamlined design, improved performance and great reliability Hands-free productivity Outstanding audio quality Multi-user collaboration, Power-saving features Talk time: up to 8 hours Headset weight: 94g Wireless frequency: DECT 6.0 Range: Up to 350 feet Audio Performance: Narrowband or wideband; up to 6,800 Hz Hearing protection: SoundGuard DIGITAL protects against sound levels above 118 dBA; Anti-startle detects and eliminates any large sudden increases in signal level; Time-Weighted Average prevents against noise level from exceeding 85 dBA Supplied with: base, headset (with pre-installed battery, eartip, and earloop), headband, fit kit (other size eartip and earloops), telephone interface cable, power supply Manufacturer Reference: 84692-02