Compatible with Plantronics® CS351, Plantronics® CS351N, Plantronics® CS361, Plantronics® CS361 Supra Plus, Plantronics® CS-50, Plantronics® CS50-USB, Plantronics® CS-510, Plantronics® CS-520, Plantronics® CS-55, Plantronics® CS-60, Plantronics® WH300, Plantronics® WH350, Plantronics® CS361N, Plantronics® W710, Plantronics® W720 Empire™ CPP-512Q, Plantronics® 64327-01, Plantronics® 64399-01, Plantronics® 64399-03, Plantronics® 65358-01, Plantronics® PL-64399-01 & Plantronics® 202599-03