PLANTRONICS BLACKWIRE C5210 UC MONO USB-A & 3.5MM CORDED HEADSET PROMO EXP 30JUN20 Plantronics Sale! from 15477 /per Qty. Add to Cart This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. BLACKWIRE 5210,C5210,USB-A,WW Qty available: 5 SKU: 207577-01 Tweet