Thunderlaser Desktop Laser Cutter 40w Engraving Machine With CE FDA SGS Class 1 Certificate This product already though the CE, SGS Class 1 certificate. Except for emergency stop, water protection and open flap protection, we even add more configurations to make our machine safer; like alarm lamp, heat alarm detector, smart control board, electric filter etc. The whole safety system is our Thunder lasers promise to every customer, especially for schools, fablab and other public using. We have a professional technical team who speak English to help our customers to solve problems easily and quickly, so language is not a question for us. In addition, we have many tutorial videos and manuals on our website; it's convenient for users to learn our machine and software. We have posted many frequently asked questions on our website; you can find the answers directly. We always stand here to help our customers to solve the problems in time; Most of our old customers are willing to recommend Thunder Laser to their friends, because we never make them disappointed. And they are willing to share experience with others. Yes, we have good relationship with our customers. The parts we use for our laser system are of high quality. Even for the small screws, we use 22 different types of screws to fix the machine, so that the machine is more stable while working. Besides, we test many brands of laser tube strictly, in order to find a good quality tube for our customers.