Is this watch mechanical or battery powered?

It is quartz, so it runs on a battery and does not need winding. Expect a battery change every year or two.

Can I wear it in the shower or while swimming?

No water-resistance rating is given, and the basic caseback and crown suggest keeping it away from water. Take it off for washing up, showers and swimming.

What is the strap made of?

The strap is leather with a stainless steel pin buckle. Leather straps age with sweat and moisture, so avoid soaking it.

How does the glass hold up?

The crystal is ordinary glass, not sapphire or mineral-hardened. It resists light knocks but picks up scratches more readily than sapphire, so avoid sharing a pocket with keys.

The heart-shaped case makes it a clear romantic or birthday gift, and the three color options let you match a taste. It is a fashion piece, so do not expect sports-watch durability.