1. 11 years Experience--11+ years experience developing,designing and producing ETCO2 Sensor 2.Strong R&D strength---Professional technical team, which made up of 9 senior engineers, continuously focus on next generation automatic door system R&D. 3.Quality Assurance 4. Professional Sales Service---Reliable and customized service will provide practice solutions tailored to your individual needs 5:Competitive Price :Factory direct, low price. Best price support policy will make you much more stronger.