Poly EncorePro series headsets are a perfect choice for traditional and in-house contact centres. Other features: - For use with a desk phone or PC/notebook - SoundGuard technology protects you from sudden loud noises and limits the average noise exposure - Wideband audio for exceptional voice clarity - Soft ear cushions for all-day comfort Connecting the headset requires a connection cable OR amplifier Neither option is included and both must be ordered separately. Please note that the required connection cable varies by phone. Please specify your phone model to enable us to provide the correct cable. The amplifier does not require an additional connection cable. 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