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What is the drawback of using Lockitron?

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What is the drawback of using Lockitron?

(a) Wastage of more energy

(b) Supports in some devices only

(c) Won’t work at some conditions

(d) Tough installation

This question was posed to me in a job interview.

I'd like to ask this question from IoT Devices in division Software Programming & IoT Devices of IOT

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Right answer is (b) Supports in some devices only

For explanation I would say: Lockitron is a device which ensures key less entry inside our home using our home. We can also monitor to see if the door is locked. And if not it will send a notification when it is unlocked. The drawback is that it will work only with iphone 4s or iphone 5.

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