If it supports 10 frequencies I needed the 11th or 12th frequency. He could see the key fob for the apartment gate, but he couldn't see or write the 3 other cards I really needed it for. If it worked my only complaint would be that the speaker is MUCH louder. It's loud enough that I would remove the speaker if I kept it. Since it couldn't read some of the more commonly used cards, I returned it.
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