Travel Charger For Plantronics 320, 330, 340, 520, 610, 655, 665 Bluetooth Headset This travel charger is compatible with the following Plantronics Bluetooth headsets : Explorer 320, 330, 340 Voyager 520, 521 Discovery 610, 655, 665 Features : Simply plug the charger into a wall outlet to charge your Bluetooth headset