Night Safety Dog Collar Waterproof Bone Led Pet Flashing Collar with Headband & USB Light Power source: LED light. Light color: Red,Yellow,Blue,Green,Orange,White Modes:Flash Quickly/Flash Slowly/ Continuous On/Off Quantity: 1 Pcs. Size:S/M/L/XL Size:S 35~43cm(13.78"-16.93"). Size:M 40 ~48cm(15.75"-18.90"). Size:L 45~52cm(17.72"-20.47"). Size:XL . 52~60cm(20.47"-23.62") Package included: 1 x Pet led collar, with 1 x CTU BroHall brand blue headband, 1 x adjustable angle USB light