The device pairs like many devices by holding down the power button until the status LED flashes blue and red. Once I had the device paired to my iPhone 6s Plus, I tried the different size tips and the device with and without the ear cushion until I found the combination that worked best for me. Because the T2 has an ear bud that stick in your ear canal as well as a loop around the ear, the device fits very securely and I had no issues with it falling out. The buttons are a little hard to figure out and it took me a while to get used to their placement and to be able to quickly tell them apart. I wish that one of the buttons was textured to make identifying them easier.
Overall the Picun T2 is a well made headset that unfortunately isn’t very intuitive and illustrates an unpassable amount of echo to the person on the other end of the call. I have a hard time recommending this headset when their are numerous other options available at this price that are better. That being said it is nowhere near the worse headset I have used.
If you are interested in purchasing one of these headsets they can be found here.