Just point at anything, and rotate the focus wheel until the image gets clear. 

It can be used as a microscope and telescope--"See" space and design of - leaves, water drops, insects, bugs, vegetables, skin, wings, fins, feathers, dust, dirt, crystals, plastic edges, metals, ants, flies, spiders, crickets, flowers, petals, roots, pencil and pen heads, paper towels and tissue, money and coins, gears of watches working, broken glass, inner light bulb, teeth, tongue ear, hair, ...... 

No, the battery is built-in, and it is recharged via a USB-C cable. 

Please rotate the focus wheel until the image is sharp and clear.