These ingenious led valve caps can warn you when your tyre pressure starts to decrease, alerting you to a possible slow puncture. They work by indicating a series of different coloured LEDS. No light - pressure OK. Flashing red - pressure low (4psi loss) for up to 600 hours Flashing yellow - battery low (up to 100 hours). Easy to fit and come with a security locking key to prevent unauthorised removal from the motorcycle and a testing tool. Self calibrates for all pressures from 10-70 psi. Temperature compensation is also built in to the units. LEDs visible both day and night. http://www.ricambimoto.uk/index.php?route=product/product&path=62_123&product_id=280
