I've had several cheap cable tracing/mapping products on Amazon. They all started great but failed quickly. Typically, the connectors become incompatible, which drives you crazy about matching wires. As much as the jack was built to precise specs, who knows. It's also easy to accidentally turn them on after the battery runs out. Like: This one spins with a wheel. I'm not going to throw it in a box with other things and accidentally turn it on. Fast/slow matching. Feels solid. While exactly. Dislikes: The receiver isn't very loud. Maybe because the tip is plastic? Or is the speaker not loud enough? But it does the job.
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