Sandberg Wireless Call Headset - for use in such locations as a home office, work or for teaching. The microphone is on a flexible arm, which ensures that the other person can hear you clearly. A speaker for each ear also means that reproduction of the other person's speech is clear and distinct. The discreet lightweight construction and adjustable headband provide you with optimal comfort. Connect to PC, smartphone or tablet via Bluetooth for immediate use. Volume control directly on the headset. Listening time: Up to 24 hours Standby time: Up to 160 hours Charging time: 2 hours