This is the Sennheiser SD Pro 2  ML is a double ear wireless headset for deskphone and softphone.  Comes with USB cable to connect to your PC or laptop. Equiped Ultra noise-cancelling microphone. Wireless range up to 400ft away (line of sight), Up to 8 hours of talk time on a full charge. The Sennheiser SD Pro2 ML is exact same model as the SennHeiser DW Pro2, except the base is a newer. Microsoft Teams Certified.

Key Features:

• Dual connectivity with deskphones and computers with USB port
• Microsoft Teams Certified
• Binaural Double Ear Headset
• Up to 400 ft range.
• Up to 12 Hours Narrowband Talk Time (Up to 8 Hours Wideband Talk Time)
• Ultra Noise Canceling Microphone
• ActiveGard safeguards the user's hearing from potentially dangerous spikes in receive-volume
• Same working model as the SennHeiser DW Pro2 (sold only in Europe)
• Compatible with Sennheisers HSL 10 handset lifter and TCI 01 for interfacing with new electronic hook-switches
• Old part# 506011

Optional Accessories:

SENNHEISER HSL10 Lifter