The 300050 is a convenient bulk box of 240 individually bagged Autel MX-Sensor 1-Sensors. The 1-Sensor is a programmable universal TPMS sensor. It features a combined frequency of 315MHz and 433MHz with rubber valve stems. The press release button allows for rubber or metal valve stems to be replaced interchangeably. The 1-Sensor is reprogrammable, 99% compatible with OE sensors, and meets SAE standards J1205 and J1206. Replacement valve stems are available for purchase in rubber or metal.