Tire Pressure Monitoring System running on solar. Backup by connecting to external power source. Size: 10cm (length) x 8cm (breadth) x 2cm (thickness) Price negotiable. ============================== Instruction manual Center button use as <Enter>, <Confirn> Left and right button: <Selection> 1. Press and hold center button for 3 Sec to enter the setting. TPMS default setting Bar threshold: 1.8(low), 3.2(high) PSI threshold: 26(low), 46(high) Temperature threshold: 75 degree 2. Press left button and hold for 5 sec to go into sleep mode, and center button to awake. 3. Press right button and hold for 3 sec to reset to default setting. Note: 1. No reading will be shown when car are stationary. Reading resume when car move off. 2. Pressure build up at tyre when driving. The bar, or PSI or temperature reading will rise slightly.