Advantages: 1. Easy control of volume and noise reduction by rotating the headband. The mechanism has no end position and runs very smoothly.2. High volume when listening to music or other content.3. Knows how to adjust volume in Windows operating system environment.4. The presence of a separate mute button for turning off the microphones. Microphone status indicator (yellow). When pressed, the headphones will speak in a muted / on voice.5. Availability of a separate Surface Audio application for different operating systems (tested Windows, Android)6. Ability to connect via Bluetooth with up to 8 devices, 2 of which can be active at the same time. Disconnect and connect other idle devices using the Surface Audio app.7. There is a built-in equalizer. Equalizer settings are stored directly in the headphones, they are the same for all connected devices. The settings can be changed independently from each connected device.8. Instant power on and connection to devices with a short press of the power button (1 sec). Immediate shutdown even after a short press of the button.9. If activated, the battery charge prognosis is announced by voice. It is convenient to control the charge.10. When switched on, the name of the device to which the connection has been established is spoken. Disadvantage: 1. Phone call volume depends on your phone's limitations. The volume is not enough for European devices.2. There is no indication in the application or in the menu of the phone / PC that the headphones are in silent mode.3. When you press Mute, the headphones will say "Mute/On" in voice. In this case, the sentence is spoken slowly (2 seconds) and the speaker in the background cannot be heard. It would be handy if this replaced a short beep.4. When the microphones are muted with the mute button, only the headphones are muted. The phone's call settings keep the microphone on, which can be confusing. on the phone during a call it is not clear whether the microphone is on or not.5. The mute status indicator is only visible when the headphones are removed from the head. When you look at yourself in the mirror, the indicator is not visible. Maybe it would be right if the indicator was displayed on the page.6. For Android phones, volume cannot be adjusted on the phone. It has its own independently adjustable level. This means two parallel volume settings on the phone and on the headphones.7. When listening to music at maximum volume, the sound breaks off, there is a certain wheezing. Apparently the speakers are not designed for the specified maximum level.8. When the name of the connected device is played by voice, the name of the device is not very clear through Cortana's voice (of course).9. Even when the device is fully charged, the headphones don't report a nominal 20 hour charge time. They keep saying there's 18 hours left.
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