The wireless CS500-series Poly Headset CS540 (CS540A) is perfect for working in the office thanks to its large range. Other features: Monaural DECT headset for desk phones, incl. EHS cable (APS-11) Three different wearing styles: Headband, ear hook and neckband (sold separately) Noise-cancelling microphone filters background noise Digital Signal Processing (DSP) for natural audio Choice of wideband or narrowband mode Wideband audio with CAT-iq technology SoundGuard DIGITAL protects you from sudden loud noises and limits the average noise exposure to 85 dBA Talk time: up to 9 hours Range: up to 120 m Weight: 22 g Includes: Headset, base station, headband, ear hook, EHS cable APS-11 Incl. APS-11 EHS (electronic hook switch) for Savi series and CS500 series. Please note that answer/end call functionality via the headset depends on your telephone system. Please note: We recommend using Poly Lens software with this product. This enables central management of video devices, headsets, phones and webcams. Other benefits: - Custom device settings - Always the latest firmware - Easy troubleshooting tool - Fast device integration - Dashboard layout with intelligent news feed