Im assuming these have an impedance rating, but its not listed or mentioned; whats the impedence rating, in ohms?

According to what I've found elsewhere, 8 ohms of impedance, 5 watts RMS, 10 watts peak.

Will they work pressed up against a surface for temporary location or does it have to be stuck on with the adhesive?

Pressing them against the surface will prevent the transducer from vibrating. They work just like a speaker, minus the cone. They can be relocated. New 3m double sided works or hot glue's great too.

Mine has stopped working. Do these run out of battery over a period of time? Or just faulty?

It might be faulty. There's no battery in these; they need to be hooked up to an amp of some kind. The adhesive might have weakened or the speaker driver could have a short or be defective.

could these be concealed behind a bookcase or couch (with a gap)? or do they need to be unobstructed?

I think that the only problem would be that the sound will be obstructed but I don’t why you cannot do it.

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Specifications

Connectivity Protocol	wired
Connectivity Technology	wired
Number Of Circuits	1
Item Weight	5.6 ounces
Item Dimensions D x W x H	0.75"D x 3.59"W x 3.59"H
Unit Count	1.0 Count
Is Electric	Yes
Power Source	Corded Electric
Impedance	8 Ohm
Number of Audio Channels	2.0
Speaker Maximum Output Power	10 Watts
Compatible Devices	Laptop, Personal Computer, Smartphone
Speaker Size	93.1 Millimeters
MP3 player	No
Specific Uses For Product	Creating hidden surround sound systems, adding sound to unusual surfaces
Color	Black
Is Waterproof	FALSE
Warranty Type	Full
Control Method	App
Audio Output Mode	Surround
Speaker Type	Surround
Additional Features	Transforms Solid Surfaces into Speakers
Recommended Uses For Product	Transforming solid surfaces into speaker systems, creating hidden sound systems

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