If We need pressing the button again when the time ending?

Of course needn't

Because we have automatic sensor function

How you can activate the light again? By removing your hand and putting it back under the lights, Without pressing any buttons.

Why not directly to set up time on constant?

If the lamp lighting on constant or long times,The beads of lamp easy heat and shorten the lifespan of the lamp.So convenient to use and prevent irritation of the skin,also keep the lifespan of the lamp,After test,We was set up 30s 60s 99s,(low heat mode)And add automatic sensor function.hope all customer have a good experience of nail art.

About Protect function

Why the light is white closing light blue not purple when we directly to see the it?

Because the purple lights are irritating for eyes and skin,so we were upgrade the design to ensure is perfect for our customers.if you want to see purple color like our main picture,Please try to turn on the lamp in a place with weak light.

What is uv led lamp?If this nail lamp is uv led lamp?

UV led lamp is means make up by LED beads and can emit uv to dry the gel,our lamp includes 21pcs led beads and it can emit uv to dry the gel,so "yes"our lamp is uv led lamp.