Jabra Evolve 75 SE, Link 380a UC

Jabra EVOLVE 75 Stereo offers wireless Bluetooth technology that gives you up to 30 meters hands-free to PC, smartphone
and a tablet. They have an option to connect with NFC. Dual connectivity allows you to connect your headphones to two
Jabra EVOLVE 75 MS Duo USB is an innovative headset for working in an open office. HD Voice for crystal clear conversations and music. Reduce noise, interruptions and unwanted sounds with high ANC technology to increase performance. More freedom with dual Bluetooth® connection to connect to two devices simultaneously for calls and music. Move freely up to 30 meters from the connected device. All-Day Comfort - Leather over-ears and comfortable design for all-day use.

Talk time: Up to 15 hours;
Battery time (with ANC enabled): Up to 30 hours;
Charging time: 2.5 hours;
Connection: Bluetooth® or USB. Dual connectivity for two Bluetooth® devices simultaneously;
Bluetooth®: Yes. Class 1 (up to 30 meters / 100 feet) and Bluetooth 4.2;
USB bluetooth adapter Jabra Link 370;
Speaker size: 40 mm.;
Integrated BusyLight: Red lights on both speakers are automatically activated when in call mode or manually activated by the user when busy to act as a "do not disturb" signal;
In music mode: 20Hz - 20kHz;
In communication and talk mode: 150Hz - 6.8kHz;