After developing the Stall Warning Device, Greene continued developing aviation inventions. Hydraulic oil tank is equipped with power steering oil level warning device . This type of warning device is mandated by the Pedestrian Safety Enhancement Act of 2010. Furthermore, the aircraft's stall warning device was inoperative. A stall warning device was later developed and implemented for the Javelin. The Klaxon warning device became standard equipment on all United States Navy ships. Warning Device is the third album by the American pop punk band Teenage Bottlerocket.