Good quality earphone. The sound quality suits me. But there is a problem when the house has several devices with Bluetooth (see. Photo). It is problematic to switch from one device to another. But this is not a problem with headphones, but wireless transmission technology. All the functions of the headphones are controlled by one button, except for the sound level. But the sound quality is such that other headphones do not want to have. Signal transmission in one room is stable.