Automatically syncs to base

Replacement Headset for Poly CS540 Includes battery, headband with leatherette ear cushion, 2 sizes ear gel buds, 3 sizes ear loops, and 1 foam comfort sleeve for back of ear loop Portable and lightweight Genuine Poly accessory 2 year manufacture warranty BTP Model: PL-86179-01MFR Part: 86179-01, 85T27AA#ABA