Modus 3500 Bluetooth headset is a premium performer in both mono and stereo modes. The dual microphone noise and echo-canceling headset delvers extraordinary sound quality. Active Pairing function makes paring the headset with another device quick and easy The Modus 3500 has multipoint capabilities and can be paired with two Bluetooth handsets or a single Bluetooth handset and stereo Bluetooth device, such as an MP3 player or computer. The package includes stereo earbud with built in mic. Talk time of up to 6 hours and standby time of up to 180 hours.