Spring/belt/flexible slots，more than 100000 tests.
Power Supply Test
Power supply,electrical accessories, all passed 80℃ environment temperature, long working full load test.
Salt Fog Test
The corrosion resistance and antioxidant properties of metal materials in salt fog chamber have been tested to ensure that they do not rust for 20 years.
The brightness and contrast were tested at 55℃ and minus 30℃.
Continuous tests at 35% current increase,ensure that brightness does not decay after several years of use.
All models are transported 50 km/h in rural highway and 100 km/h in highway to ensure that parts are not loose.
Over 1000000 press tests.
20000 tests, assuming the frequency of use twice a day, the service life is guaranteed for more than 20 years.