Hi
Regarding hand signals . I have three rearview mirrors on my road bike and an electronic turn signal. The reason for the turn signal was: most folks have no idea what a right turn signal is with the left hand. I was almost run down three times because "they do not have a clue.' If I hadn't been observant, I wouldn't be here now.

I watch diligently. Look over my shoulder consistantly, and wave cars on when possible before making my turn. Got to watch and drive very defensively. I let them know that I know they are there. Many folks have little respect for motor cycles and even less for bikes. This is true at least in my area.

The light is very bright even in daylight. The only drawback is the the brake and turn signal lights are all red. The unit cost just $5.49 and uses AA batteries. I bought two more and am adapting two amber shields in place of the red turn signals. Cut and glue project.

There is an expensive unit direct from China. Li-on Battery and wireless. $76. Free shipping until end of October. I am not promoting the product. But with all the bikes just in Beijing, one can understand why these items are more available from them.

Best!