For connecting to the smartphone of MPOW Cheetah with APTX codec is exemplary prepared for a high-quality listening experience. However, the perfect hi-fi sound, you should not expect it to because this headphone lack a little bass. But I feel the issue Audible Books as exemplary, almost as if the device optimized especially for the voice playback. Depending on the movement noise of the overall construction can be transferred to the ear plugs, which abuts the body.
The MPOW Cheetah also acts as a speakerphone and has, for example controls that allow answering and the increase or decrease the volume. The sound quality on the phone is okay. It should be noted is perhaps still the English manual, but I am clearly got away with it. The service is not so complex. The power button is the button with the handset on it (answer), the coupling was carried out for Smartphone straightforward. Charging the built-in battery before use is recommended.
* My Opinion: A attractively priced sports headset that does not fall down so quickly. APTX represents a sound quality Bluetooth communications with a smartphone, but I lack a little bass. Despite everything, in my view is a good value for money and therefore 4 stars from me.