Note:

As a seller, I can only ensure the integrity of the product, and can't guarantee that everyone can soldering 100% successfully. The successful soldering is based on personal circuit knowledge and welding experience. If you have any questions, you can contact us for consultation, and will try to help. However, please do not dispute on the failure caused by personal welding technical problems.Power supply: DC 5V voltage power supply, you can use a computer or cell phone charger power supply, take care not to use a power supply higher than 5V, otherwise it will burn out. Spectrum mode, if the audio cable is not connected to the phone or computer, it is easy to appear interference jumping. Spectrum mode volume should be above 50%, otherwise the volume is too low will not be distinguished. Gain in the menu settings is the spectrum gain, spectrum beating too low, then you can adjust the gain (or adjust the volume higher); easy to full screen, then you can adjust the gain lower (or adjust the volume lower).