At this moment there are two versions of the Tire Pressure LED.
One we recommend for use for tires with 10-70 psi (0.7-5.0 bar), which is for passenger vehicles and SUVs, and will start flashing for a 4 psi (0.3 bar) pressure drop. The other version is designed especially with the heavier vehicles in mind and is recommended for tire pressures ranging from 60-170 psi (4.0-11.0 bar).

This version will require an 8 psi (0.6 bar) drop before it starts flashing