Manufacturer did not provide instructions for use. Fortunately the device is simple to use and works like other bluetooth devices.
Headset is not adjustable and quite boxy. Sound is very good and device does work at quite a distance. Just what I expected for the price--good value.
Very happy with this purchase. I rate it a 5 (excellent) for the price. The sound seems very good and it was delivered promptly. My only criticism is the product came with no directions on use, such as, pairing and buttom controls.
For this low price you get surprisingly clear audio and a comfortable headset. After my original purchase, I went back and bought two more for gifts. Very happy with the overall value. Highly recommended.