If the title seems familiar, it’s because there’s no visible difference (apart from the “brand name”) between the Enover timer that failed a little over a year ago and the Kuoke timer that recently failed:
That’s what it looked like after the repair. Prior to that, it’s just a blank display with no response to any inputs.
Given identical hardware, the overheated phenolic PCB under the Zener diode came as no surprise:
As promised, though, this time I epoxied a brass shim heatsink to the new diode in hopes of cooling it enough to live long and prosper:
I suppose I must now preemptively affix heatsinks in the two surviving timers, because we all know how their stories will end.
The Smell of Molten Projects in the Morning 
Given the name of the company, and the country of origin, I have to ask… Is it UL Listed?
As the saying goes, the only reason that thing would have a UL certificate is the original owner didn’t notice it was missing …
Better than UL, i’m sure it’s marked CE: China Export.
Why, yes, it is:
So it must be good!
I dunno what a W.μ (watt-micron?) is, but 1800 sure sounds like a lot of them! Google assures me it’s 1.8 billion meter-kilograms per cubic second…
Claiming a hundred days from that little NiMH cell seems aspirational, too.