TIRE PRESSURE INDICTOR CAP -safety concern -easy to install -simple indication -extend tire life TIRE PRESSURE INDICTOR CAPtyre pressure valve with monitorCAC1206-4PC ... to 100PSI Instruction Show green color, indicating the tyre pressure is in safe Show yellow red and green color, ... in danger Show yellow and green color, indicating the tyre pressure is not enough, you must inflate tyre. Packing: ...