Sent it back.

I thought I needed this for nights on call so it would wake me. But if your smart phone will not vibrate solid for a full 4 seconds it will never work. I changed my Samsung phone to the longest vibrate possible and it didn't see it. Just download an obnoxious tone and have it remind you several times. You will wake up and if you are like me, you will learn to hate your phone. But hey I am on call frequently and it is my job.

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