I bought a headset despite the fact that both devices (both a tablet and a phone) were with Bluetooth 4.0. As I wrote above, I was very dissatisfied. But as soon as I bought a new phone (Bluetooth 4.2) - everything began to work fine. Not perfect, but already usable. Has some pros The sound is quite decent for the money, the battery holds perfectly, it can connect to 2 devices at once, which is convenient if you have a phone and a tablet, for example. Some cons: The microphone works disgustingly if you connect a device with a Bluetooth protocol less than 4.1.
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