MATERIAL: Polystyrene lens & ABS base TYPE: Road safety indicator light set with 2 batteries (Excluded) SIZE: Lens: 18 cm COLORS: Yellow/Amber WEIGHT: 531 g FEATURES:7_ standard amber lens,with advanced optics for increased visibility Tamper-proof switch requires pin for activation,increasing security Optional on at dusk,off at dawn photo cell extend battery life With Bright LED UV Stabilized High Impact PE Case 18cm Optical Amber Poly carbonate Flashing Panel Automatic Internal Photocell Activation With Manual Key