Bluetooth connection caused slight delay in sound

I find the sound quality very good, but it depends on what you want to use the headset. If you vewenden usually very high quality headphones, may be another your default, but for everyday use, there is nothing to complain about.
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CALLS

The headphones have a built-in microphone, so you can use them as a wireless headset for telephone and Internet calls. The quality of the microphone is good, but the Bluetooth connection provides a slight delay, which calls feel a bit disjointed. This is true, however, apply to all Bluetooth headsets that I have tried. It is not such a bad delay, but they should be mentioned.
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WIRELESS CONNECTIVITY

The Bluetooth connection was easy to set up (I tried it with Android devices and a PC.), And it's great to move freely and be able to walk around without a long cable to have in the way. I found the connection with a range up to 5-10m be reliable and clear.

If you plan to use these headphones for watching movies on a computer or tablet, you should know that the delay through the Bluetooth connection ensures that the sound is no longer in sync with the picture. You can solve this problem by using a player which allows you to adjust the synchronization. Popular players like VLC can do this.

I use the headset also to television, as I'll connect you with a small Bluetooth transmitter, which is plugged into the headphone jack of the TV. These transmitters are quite favorable, but even here there is a delay in sound, so you need to be sure that you can make settings on your TV to match the sound synchronization.
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CONTROLS

The controls are very simple and practical. On the left ear are the buttons for volume control (also used to jump to the previous or next track), a button for play / pause and a 'Sprech' button for voice dialing and receiving calls.

The headphones also give you a few short voice commands through the outer ear to help you set up the Bluetooth connection. These announcements are in English. However, the written instructions are multilingual.
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COMFORT AND DESIGN

The headphones are so light that you hardly feel on your ears, and you can move quite freely and vigorously, without them falling off. Thus, they are very suitable for jogging and perquisites.

The plastic piece that connects the two earpieces, curving behind the ears, so I was afraid that there are problems when wearing glasses. However, I do not feel any loss of comfort when wearing the headset and glasses together.

Because the headphones are made of very light plastic, it does not make the impression that they would last forever. The foam padding on the ear cups are also very thin, so I can imagine that they wear out pretty fast. But the manufacturers seem to have considered this and provides the headset with an extra pair of foam cushions.
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Sound leakage

These headphones block external noise is not very good, and people in your community may be able to hear your music, etc.. Because they are on-ear headphones, you should expect more sound leakage than with in-ear or over-ear headphones.
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Battery Performance

Battery performance is very good, I can listen all day to music with headphones, without that I had to recharge the battery. The battery is permanently installed in the headset, so you him to charge in a USB port plug must be him.