HGD&reg; Dog Collar with LED Lights Four Size S M L XL Five Colors LED light glows and flashes in darkness Pet Dog Safety Collar,6 colors to choose Small: W-2.0cm X L-22 cm extends till 40 cm Large: W-2.0cm X L-48 cm extends till 60 cm Middle:W-2.0cm X L-32 cm extends till 50 cm