The ZK-MT21S amplifier performs well overall—the sound quality is solid and installation was easy. It’s just a bit bulkier than I expected, but it still fits in my setup without issues.
Top-notch CA-AS21 amplifier board! Installed it in my DIY speaker setup, and the sound output is brilliant. Works perfectly with 12-24V power, no glitches so far. Great purchase!
This 5S BMS board works reliably for my solar battery. The wiring terminals are a bit loose initially, but tightening them properly fixed the minor issue.
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