2 aircraft ordered, only 1 works

2 aircraft ordered, only 1 works

Digital Detector Carbon Monoxide CO Gas Alarm (Electronics)
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Customer Review

I ordered and received 2 units. One works, the other does not light up even it is completely off.
The seller offered me a refund for the defective sensor and reimbursed me.
I would have liked to compare CO values ​​displayed with the 2 devices because I read on reviews that the values ​​can be very different between 2 devices. Unfortunately I have not been able to do, which does not allow me to give an opinion on the quality or reliability of the product ...

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