
I've had the product for 3 days now and have tested it 20 times. 12 times the notification lock is triggered by pressing the red button, the remaining 8 times nothing happens. This is a complete failure as there is no way to tell if the device is NOT working. The teacher had no evidence. It seems to me that this product uses cheap parts or was never properly designed from the start. I'd happily pay double or triple for a stable product but I can't find it on Revain so I don't have a choice. I appreciate recommendations from other users.

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