The whole tour is free but you need to make an appointment as they only allow a limited number of people per visit.
1. There is a mandatory registration and temperature check at the front door before you enter.
2. You must walk on the sidewalk of the factory area, because there are many cars, please try and cooperate with management.
3. Keep quiet when you visit, there are offices nearby.
4. The museum is not big, but staff will be happy to give you a tour or let you wander.