Plantronics CS540 Wireless Headset w/ Microphone- FOR PARTS/NOT WORKING PROPERLY

$15 + shipping, OBO. Shipping in the U.S. ONLY. Cross-posted. FCFS; no holds. This item is FOR PARTS ONLY; IT DOES NOT WORK PROPERLY. Last time I used it in April 2023, the audio had static inference & I was unable to diagnose the problem. Perhaps someone more tech-savvy than me can. Please comment with any questions. Thank you for your consideration!