Tire pressure monitor system 0-145 PSI Visual & audible pressure loss warning levels. Temperature alarm. Kit includes: Moitor & adjustable bracket. 4 screw on pressure/temperature transmitters. 12 Volt car charger. 4 Extra Litium batteries for transmitters (1 year life) 4 Anti-theft locks with screwdriver. This system is capable of monitoring up to 22 transmitters.