I bought them on sale for 12.90. Unfortunately, I received a defective piece - the sound was distorted when connected via Bluetooth, and after 2 days of use, they completely stopped playing sound through Bluetooth. Currently, I have sent them to the service center and I am waiting for a response regarding repair or replacement. However, I will review the other aspects of the headphones based on the time I used them.
Firstly, regarding the sound, which is the most important aspect, when connected through the cable, it played flawlessly. The sound quality was very good, especially considering their size. The bass was very satisfactory and powerful. They didn't reach the volume levels of more expensive headphones, but they definitely fully covered my needs for music and movies that I tested them with. There was no distortion when using them with a wired connection, no matter how high I turned up the volume. Hopefully, after the repair/replacement from the service center, they will have the same sound quality when connected via Bluetooth. They will be the best value for money wireless headphones.
As for the build quality, they generally feel cheap due to the plastic material used for most of their construction. They are also foldable to take up less space during storage/transportation, but when I closed them, I felt like they could break with a little more force, so I was very careful. Additionally, the on/off switch is very stiff, and combined with its small size, it is difficult to turn the headphones on/off with one hand. Personally, I had to take them off every time I wanted to open or close them because the switch was quite inconvenient to use.
In terms of comfort, their ear cushions were quite soft (and relatively good quality), but due to their small size, I couldn't wear them for more than an hour continuously without feeling discomfort (although I don't have the smallest head, of course). However, they are very lightweight, and you don't even feel them on your head as extra weight. Also, since they are on-ear headphones, they can get quite warm on the ears, especially in combination with the current summer season, so you will definitely start sweating within an hour.
Their sound, at moderate to high volume, adequately covers the surrounding noise in an outdoor environment, but in a crowded and noisy place, they don't have the best sound isolation.
Finally, the battery life seemed quite satisfactory. When I took them out of the box, they had 30% battery, and with considerable use for movies and music, it took 2 days before they needed to be charged.
In summary, I give them 4 stars due to the average build quality, average comfort for a medium-sized head and above, and the fact that they stopped working within the first 48 hours. However, they are definitely worth the price of 12.90, and if after the repair, their sound through Bluetooth is comparable to the wired connection, then I will definitely give them 5 stars.
Update 29/03/2021:
In the end, Crystal Audio's official service replaced my headphones with a new pair. It took about 20 days from the moment I contacted them until the package with the new headphones arrived at my house. The new pair was perfect and fully functional, with no issues regarding the sound, whether connected via Bluetooth or wired. Since then, and up until now, the headphones have been working normally without any problems, with careful use and handling. Therefore, the headphones deserve 5 stars considering the price I paid, as I don't believe there is anything more competitive at this price.
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