Description:Size: 21.8*7.2*2.8cmQ&AHow to wire?5V USB power supply, with its own power line, which can be powered by mobile phone charger or computer USB port. You can beat with sound. If you need to use an audio cable for control, just plug the audio cable into the audio output port of the sound source (3.5m headphone port), and the voice control function will be automatically turned off and switched to the line control function.Can it be used in cars?The car has too much light during the day, so the display can't be seen clearly. The effect is only effective at night. It is not recommended to use when the interior temperature is too high.Will ambient noise have an impact?In a noisy environment, you can use the audio cable control, or turn down the sensitivity and turn up the music.Can I turn off the spectrum to display only time?It can only display the time, which is not controlled by the sound, or it can not display the time, and only has the spectrum function.Can I charge it?It should be powered by USB all the time and cannot be charged.Can I use the power bank for power supply?You can't use the power bank for power supply. The power bank has an automatic power off function.