The solar panel is use to extend the battery life. In winter, you still need to charge the battery with USB plug regularly.
Please fully charge the backup camera before using the solar panel.
There is no battery contained in the solar panel, it is just for charging use.
This solar panel only work for TW1 camera, it can't fit other models.
Warmly tips: There are 2 version of solar panel we sold now,if this one you purchased not fit your backup camera, please contact us for correct one.
AUTO-VOX Solar panel for TW1 wireless backup camera for Car