Precautions:
1. The power supply of the device is USB 5V power supply (USB Type-C interface). The power supply needs to use an adapter of more than 2A. The USB of the computer cannot start the device because there is only 0.5A output. Please use the provided adapter or a USB with more than 2A. adapter;
2. There is a 250V booster circuit inside the host, and the motherboard has high voltage. Please do not open the cover with power on
3. The electronic tube has a start-up time of a few seconds to a dozen seconds after it is turned on, and it can work normally after it is started;