Wireless - Bluetooth - Cell Phone - Computer - Plantronics - 7 hour battery The no cord, no fuss UC speakerphone. The perfect tool for impromptu conference calls, the Plantronics Calisto 620 is a portable wireless UC speakerphone that instantly transforms your laptop or smartphone into a high-quality conferencing device. Small and lightweight, the Calisto 620 provides professional-sounding audio and wireless connectivity, wherever you touch down.