Here, we need to understand a basic concept: decibel - sound pressure level of the size of the unit (symbol: db), sound pressure for each doubling, the sound pressure level increased by 6 decibels. 1 decibel is the sound that human ears can just hear; generally speaking, 15 decibels or...
Every day, you hear all kinds of crime news on TV... In today's society, unpredictable crimes happen from time to time. The feeling of worrying whether your family will be involved in an incident exists in one way or another. MYPRINCESS personal alarms can help by gaining the attention of outsiders...
Original design is the mission of a product, and we insist on original design to make the product stand out in the competition. Enhance the value for our customers.
