On July 24, 2026, Japan's Ministry of Internal Affairs and Communications (MIC) issued amendments to the Radio Equipment Regulations, which took effect on the same day. This revision reintegrates regulations for specific low-power radio stations within the 433 MHz band and establishes tire pressure monitoring systems (TPMS) and keyless entry systems (RKE) as separate categories of radio equipment.

Among them, the 433 MHz related equipment band specified in Article 49-14, Item 5 has been expanded from 433.67–434.17 MHz to 433.05–434.79 MHz; The frequency band range for TPMS and RKE has been adjusted from 433.795–434.045 MHz to 433.05–434.79 MHz, and the regulations have also removed the original structural condition that "the chassis cannot be easily opened." For certified old products, the original certification remains valid without changing the original operating frequency or technical parameters, without needing to re-certify.

Click this link to view the original text of MIC Amendment No. 91.