I am very satisfied with the collar - quality, luminosity bestens- all I had previously already blaue- of the same type but which was unfortunately just not available and so I decided for the yellow and no regrets! My blond Terrier is therefore in the dark winter months at night visible. The only drawback is the poor refilling the batteries - to be considered a new smooth Buy collar because lavishness of mini screws - the bend and the same price for a new battery hardly therefore of counting only 4 points.