This dog collar by #Zogin is a great idea as it’s visible all the way around the neck instead of just a light which hangs from the collar. The lights are nice and bright and very visible. It comes large and can be cut to size.
There are three lighting modes, fast flash, slow flash and constantly on. There is a usb cable included for charging (they recommend charging for 4 hours initially and for the first few times to condition the battery)
I have found its best to have it large enough that it can be slipped over your dogs neck rather than having to undo it - not that undoing it is really a problem, it’s just that I prefer it and there’s less chance of the locking mechanism breaking this way if it’s left done up.
This is a great safety item to have for your dog especially coming up to the autumn and winter or if you walk your dog at night.
This collar can be bought here: https://www.amazon.co.uk/gp/product/B01N3TRMKI/ref=oh_aui_detailpage_o09_s00?ie=UTF8&psc=1