Adjustable Colorful Butterfly Pet Led Nylon Night Safety Collar with Headband & USB Light Material:High density braid+ LED Super Bright Light Optical Fiber+ Electronic Box + Buckle .Battery Type: 2pcs 2032 button batteries Color:Red,Yellow,Pink,Purple,Green Size:S/M/L .Quantity:1 PCS Size:S , Width:2.5cm(0.98) , Length:35-43cm(1.78-16.93) , StretchScale:8cm(3.15) . Size:M , Width:2.5cm(0.98) , Length:40-48cm(15.75-18.90) , StretchScale:8cm(3.15) . Size:L , Width:2.5cm(0.98) , Length:45-52cm(17.72-20.47) , StretchScale:8cm(3.15) Package included:1 X LED Flashing Lighting Pet Collar, with 1 x CTU BroHall brand blue headband, 1 x adjustable angle USB light