Check the listing for details. PLANTRONICS Poly CS540 Wireless DECT Headset - Black. Color: Black, Condition: Used, Made in Mexico. Listed at 35.99 USD. The Plantronics Poly CS540 Wireless DECT Headset in Black is a sleek and efficient single earpiece headset designed for home telephones. With wireless Bluetooth connectivity and DECT RF technology, this headset provides convenience and flexibility. It features advanced functionalities such as volume control, noise cancellation, and a built-in microphone, making it an ideal choice for users looking for a high-quality audio experience. The headset's headband form factor and comfortable earbud design ensure all-day wearability, while its wireless charging capability adds to its modern and practical features. Made in Mexico in the 2020s, this Plantronics headset combines style and functionality for a superior user experience.