"Very easy to fit and connect and no glass to break - just press the plastic face and then use the key to reset. It only has the 470 ohm resister not the 68ohm (I think this should read 680ohm) but it is ok for most fire alarm systems. It is supplied with a surface box but can also be easily fitted onto a flush metal box in the wall."
"In use its great because you only need a key to reset it, no glass to change as it has a resetable plastic "element" (see the pictures)
The info says it is fitted with 470 ohm AND 68 ohm resistors. It actually has a 470 ohm resistor, not 68 ohm (it should say 680 ohm) 470 ohm is very common, but if you want no resistor OR 680 ohm this is NOT for you as you can NOT change it."
"So easy to reset after use, as the 'glass' is a flexible plastic, and doesn't need to be changed each time. A tell-tale yellow 'flag' drops down to show that the 'glass' has been pressed. So there's no dodgy glass to change either. Plastic reset key is a little bit small, but the keyhole is on the front, so it's easy to get to for resetting/testing."