Pet Dog Led Harness Flashing Light Night Safety with Headband & USB Light Power source: 2x CR2032 Light color: Red,Yellow,Blue,Green,Orange,Pink,White,Rainbow Modes:Flash Quickly or Flash Slowly,Continuous On or Off Size:S/M/L Size:S , ChestGirth:32~40CM(12.60"-15.75") , Width:2.0CM(0.79") . Size:M , ChestGirth:38~50CM(14.96"-19.69") , Width:2.5CM(0.98") . Size:L , ChestGirth:43~60CM(16.93"-23.62") , Width:2.5CM(0.98") . . Package included: 1 x Pet Dog LED Harness Flashing Light Night Safety, with 1 x CTU BroHall brand blue headband, 1 x adjustable angle USB light