As mentioned by another friend below, if you wear them for a long time, they can be tiring on the ears. However, I wore them while running without any issues with sweat, nice sound, good support in the ear, and the callers (without loud noises in the surrounding environment) could hear me clearly. They are extremely satisfactory for their price. The battery actually lasts for several days.

Update 19/10: Literally, the battery is incredible, but in a semi-noisy environment, your caller cannot hear well, you have to speak loudly which is somewhat uncomfortable as everyone around you can hear you.

I have had them for a month and I use them constantly. For the price I bought them (I found them on sale for €50), they are full value for money. They connect easily to my smartphone and tablet, they actually have a range that exceeds 15 meters (depending on obstacles), very satisfactory battery life, good application, and very good bass (adjustable). The only relatively negative thing I have to mention is that when you wear them for a long time (like me, who listens to a lot of music), they become a bit tiring on the ears, you feel a slight discomfort.

Update 7/12/2023: After 2.5 years, yesterday the right earphone (which also has all the settings) gave up. I will see if it is worth repairing.

Update 22/2/2024: After about 2 months (in storage in anticipation of possible repair) and in a random check and recharge, it was found that it is functioning normally! Under observation.

The first earphone I bought. The packaging contains 3 different sizes of ear tips to fit as best as possible in the ear. Nice sound, bass. It almost isolates external sounds and I only hear the music playing through the earphone. I use them when I run 5km. They connect easily and quickly to the mobile. Its battery won't bother you at all, especially when you have the case with you... it lasts for a loooong time! I am very satisfied with the purchase!