Details
1. The LED lamp does not include a USB charger.
2. The lamp does not include a battery and cannot be directly connected to USB charging, otherwise it may cause the screen to burn out.
3. The lamp can only light up when the battery voltage is greater than 3.0V. If the voltage is insufficient, the voltage can be increased by connecting in series (rated voltage 5V, generally above 3V can light up, but the battery energy is too low, so it is unstable when lit).
4. The lamp can only display four Chinese characters or four letters at the same time.
