I bought this to add an OTP item to my smart lock so my daughter can generate a code on a specific window and enter the door. For this purpose it works great. Once you burn the seed and change the settings to 30/60 seconds they perfectly suit what they are used for. I was able to generate 10 codes from 3:10 to 3:20 and program them into my door daily so it can enter without the risk of someone else walking in with the same code as they are all erased once the door is opened . in the meantime. The only problem I had was trying to find and use the right app. It is best to use a QR reader and scan the QR code on the packaging.
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