Pass band (min): 20 Pass band (max): 20 Weight: 177 Accessories included: - Evolve 75 headset- USB Adapter Jabra Link 370- charging station- Shortened operating instructions- Protective cover- USB cable (for use when charging) Other features: - Talk time: up to 15 hours- Battery life (with ARS enabled): up to 30 hours- Charging time: 2.5 hours- Active noise reduction: Yes, the Hybrid 4 microphone delivers 17 dB (experienced noise reduction in offices)- Eavesdropping: Do not miss important messages or questions from colleagues. Press the right ear to hear the sounds from the environment, without having to remove the device- Skype for Business, Avaya, Cisco and more- Connectivity: Bluetooth® or USB. Allows you to connect two Bluetooth® devices simultaneously- Bluetooth®: Class 1 (up to 30 meters) and Bluetooth 4.2- Speaker Size: 40 mmBuilt-in busy LED: The red LEDs on both earbuds are automatically turned on when the user is talking or manually when the user is busy. - This way, a "do not disturb" signal is sent.- Microphone type: Medium-length jig with unidirectional ECM microphone with noise reduction