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Unfortunately, after a month of light and non-daily use, it never turned on again. Also, I would like to emphasize that the initial installation of the sim card is not easy. In order for the sim to work on a 2g network, you have to do three unanswered calls to 0000, restart it, do another unanswered call to 0000, and then it unlocks. Until then, if you don't do these steps, it tells you to insert a compatible sim card. Of course, the difficult part is not that, but that all of this is not mentioned in the manual. I found out about it accidentally in the comments of another site.

Nice clean sound and at high volume naturally on an amplifier, they are worth it for an upgrade from the factory sound. Not for posers

Very good amplifier for the money, it is honest.
I can say after 3 months of use, it doesn't understand anything... I have connected more than 4 pioneer 80rms each and one 180rms sub and it plays comfortably. It produces very clear sound for its price.
Update.
Almost a year later, it still hits hard.

So I installed it in a Volkswagen Polo because it had a Chinese source and generally had poor signal, so this brought it up to par. Relatively easy installation, the only thing you have to do is steal power from the battery cable that goes to the source to supply it

Τα χρησιμοποιώ στη δουλειά καθημερινά εδώ και 6 μήνες.Πρεπει να πω ότι είναι το πρώτο παπούτσι που αντέχει πάνω από 3μηνο!!!
Δεν έχουν πάθει τίποτα και κάθε φορά που τα πλύνω με ρωτάνε αν είναι καινούρια.
Πολύ καλή ποιότητα κατασκευής και χρώμα που δεν ξεθωριάζει.Το μέγεθος είναι ακριβώς.Στην αρχή είναι κάπως σκληρά αλλά μετά από κάνα δυο μέρες εφαρμόζουν στο πόδι χωρίς να ενοχλούν.

Although I don't have them in an amplifier and I have them directly to the source, they play well and cleanly. Simple design with easy installation.