Tire Pressure Monitoring System charge using USB. One charge last 40 days. The valves has anti-theft capabilities, require special tools to remove after tightened. The TPMS will auto hibernate when the bike is in stationary and awake when move off. The back light will auto illuminate at night. Monitor Size: 8.4cm (length) x 6.6cm (breadth) x 2.3cm (thickness) Valve: 19.5mm by 16.5mm Price negotiable. Cash and delivery 1-2weeks. Collection at Toa Payoh or Buangkok MRT,or arrange delivery ============================== Note: Pressure build up at tyre when driving. The bar, or PSI or temperature reading will rise slightly.