B0804-02901CL Spiral Whip Lights Functions&Troubleshooting

They have an application to control it from the cell phone?

The item is Remote Controller Control style. It can not be controlled by cell phone. If you want the Bluetooth APP Control style, You can purchase product B0804-03201CL.

One of the lights is not functioning properly, while the other one is working fine. Could you help me with this?

We suggest that you first check whether the problem lies with the light strips or the control box.
Switch the positions of the light bar that is on and the light bar that is not on, and see if the light bar can light up when connected to the non-lighting position?
If it can light up, it means the light bar is the problem, and if it cannot light up, it means the controller is the problem.
After confirmation, you can contact us and provide the specific details or a video to show the issue directly. We will then send the corresponding replacement parts to you.

Can these be made to shine just a white light?

Yes, the product can be set to only illuminate white light. You could use the remote controller to set the lights into white lighting.