diff --git a/TPMS-Cars.md b/TPMS-Cars.md
index 0dd94e4..8d667bd 100644
--- a/TPMS-Cars.md
+++ b/TPMS-Cars.md
@@ -1,3 +1,3 @@
-At this time, the app decodes data from [Schrader TPMS sensors.](https://www.schradertpms.com), which seems to be the most used in the automotive industry.
+Tire Presure Monitoring Systems(TPMS) operate in the ISM Licence free bands. In USA and most of the world they use 318mHz, in Europe the frequency is 433.92mHz. The App at this time,decodes data from [Schrader TPMS sensors.](https://www.schradertpms.com), and this seem a common standard used in the automotive industry.