Good product. Still to be tested for a loger period.
Product arrived completely dead. I contacted the seller. First, they asked me to send a video to their email. I did it 3 times, but it never got through their server. Then they accepted upload of pictures. I told them many times there was no external visible damage but they just kept insisting I should check the product for damages and defects. I asked if they wished me to open the device to check for internal issues, requesting them twice to expressly confirm that would not void the warranty. They completely ignored it. All the attempt to communicate with them were very, very frustrating. I am not sure if that was because they have difficulties with basic English or because they were just gaining time for dispute period to expire. I am also disappointed the dispute resolution by AliExpress. Instead of letting me return the product, they left me with the useless dead instrument and gave me only half of my money back. Very bad experience.