Check the listing for details. Plantronics CS540 (C054) Wireless Headset, Earloop, Base, Phone/Power Cord. Color: Black, Condition: Used, Made in Mexico. Listed at 14.00 USD. This Plantronics (C054) wireless headset is perfect for hands-free communication. With a comfortable earloop and single earpiece, it allows you to multitask while staying connected. The black color and sleek design make it a stylish addition to any office or workspace. Wireless technology and a DECT RF connection provide clear and reliable audio. The boom microphone ensures your voice is heard loud and clear. This headset is compatible with a variety of devices, including phones and computers, and offers multiple connectivity options. Overall, the Plantronics (C054) is a great choice for anyone in need of a high-quality wireless headset. Worked last time I had a land line. Powers on and headset beeps when buttons are pressed.