who has a sporty (possibly larger) dog and would like to see this in the dark permanently (!!!) is the right place for this fixture.
Above all, the constant luminance, robust construction and water tightness are compelling. In my Labrador I leave the lights always on the collar, at least now in the dark winter months.
I bought 2 red lights and attached to the collar, because by the weight of a lamp with the collar turned naturally under the mouth / chin and is therefore more difficult to see from a distance. So at my Double variant sits a light on the top and a bottom.
Unfortunately, the arrival and take them from is already annoying and the only weak point. For those who rely on the attachment to the rubber will determine that. Because the attachment is ideal only if the collar has exactly the dimensions of 25 mm, then you can thread it, provided, however, you have a buckle collar with thorns.
The mounting rubber is torn with me after a few missions at romping with other dogs. For the price losing would obviously annoying.
I rate the lamp anyway with 5 stars, because you can make do (25 mm width) with Velcro, instead of using the rubber attachment. Those who value the criteria described above, so much in the dark and twilight the woof runs free, will not be disappointed. I was too annoying for other Beleuchtungslöungen the constant recharging.
Also tearing at raging came with other solutions more frequently or presented as an additional "light necklace" another Einfädelgefahr in the forest on branches etc. is.
For fixing to harness I can not say anything.
I recommend buying for active dogs and their owners, then the price-performance ratio OK. For small dogs, I consider the acquisition too expensive and would prefer other solutions.