My first two, and to date last; Imalents were the Imalent HR20 XP-L HI . This was about 2 & 1/2 years ago best I recall.
My two worked correctly for the most part after some surgery I did myself.
But what really disappointed me with Imalent was the picture below shown below, taken from many in THIS POST about the HR20
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Take a close look at those wires. 
… Go to the linked post if you want to see & read more.