PLANTRONICS BLACKWIRE 3320-M, UC, STEREO USB-C CORDED HEADSET PROMO EXP 30APR20 Plantronics Sale! from 8509 /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 3320, BW3320-M USB-C Qty available: 5 SKU: 214013-01 Tweet