As long as the ring light is connected to the power supply, it can be used 

Dear customer: Hi! It supports up to 512GB TF card, and it is recommended to use Class 10 or higher. Among the products you purchased, we sent you a 32GB TF card. If you would take out the memory card every week for checking, so for you personally , it is completely enough. Hope our answers are helpful to you and wish you a happy life! Dsoon 

Yes, plant cells can be viewed with lens 2 

These binoculars have night vision in low light conditions and can be used at night but not in total darkness. 

No. I bought it based on the claim that it would support the weight, but it doesn't. However, i have found that if I don't try to use the cantilevered function, but just use the height of the combined tripod and arm (straight up) and the ball joint holding the binoculars, I have more than enough height to see anything up to about 75 degrees comfortably. In the video, the eyepieces are at 6', and there is easily another foot of extension available.