Can this noise machine work without it being plugged in?

Yes it a rechargeable machine, works without the plug if charged

Quality of Thunder sound ?

I’ve had many sound machines over the years I’d say that this thunder and the showers are really excellent.

Could someone list the nature sounds please?

1-4 Sounds:1.Ocean waves--2. Waves--3.Keyboard Typing--4.Midnight Surf 5-8 Sounds:5.Bird Sounds Relaxation--6.Snow stream--7.Ocean Heartbeat Piano Ballet--8.Rain and Thunder- 9-12 Sounds:9.Dream Forest--10.Cricketspassing--11.Epic Thunder and Rain--12.Rain 13-16 Sounds:13.Realtime Fireplace--14.Thunder Drizzle Bonfire--15.Harry Potter Magic House--16.Real Time Library

Manufacturer	OnLyee
Item part number	CR1016
Product Dimensions	16 x 5.59 x 6.6 cm; 341 g
ASIN	B09S6GK6MJ

Portable White Noise Machine for Adults & Kids, 42 Soothing Sounds with Lullabies & Fan Sounds, Auto-Off Timer & 8-Level Volume Control

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