Functional cable, magnet could be stronger

I ordered this cable as a "second charging cable" for the office and charging that my Sony Xperia Z1 Compact easily and quickly between the USB port on the office computer for. The magnet that holds the cable to the waterproof external charging port of the mobile phone could be stronger, but this is reserved for the more expensive cables of this type (see my other "cable review").
To load in the office in calm chairs of the phone on the desk, it is sufficient and therefore there's this premise 4 stars.