Answer:
I am a mini solar powered computer
Four leaves I have.
I may be made of metal, bone, or wood and have many teeth. My bite hurts no one and the ladies love me. What am I?
You may enter, but you may not come in. I have space, but no room, I have keys, but open no lock. What am I?
I am always in front of you, but you will never see me. What am I?
What is yours but only used by others?