Can this humidifier run at night without emitting any light (like a glowing power button)?

Not really - instructions state the night can be turned off by a long press a third time. It does go off for approx 30 minutes. If you can fall asleep and stay asleep than there is the availability to turn off the night. For anyone who has trouble falling asleep and staying asleep night light is a constant on. What a crazy defect

What kind of power source does it use?

The unit comes with a USB style cord similar to a phone charging cord. It does not come with a plug - I used a spare from an old phone charger and it works very well.

Is there a filter that would need to be cleaned / replaced?

24 Pieces Humidifier Cotton Sticks Filter Replacement Wicks Humidifiers Filter Sticks Refill Sticks for Portable Personal USB Mini Humidifier Supplies, 8 x 136 mm https://www.amazon.com/dp/B0867FMFL6/ref=cm_sw_r_cp_api_glc_fabc_YFs6Fb79MCDPK?_encoding=UTF8&psc=1

After it turns off (after 12/18 hours), does it restart on its own or does it need to be manually restarted?

Dear Customer. Thank you for your question. This small humidifier will automatically recognize when the waterfalls below the alert line and turn off, but restarting requires manual operation. Sincerely, SmartDevil

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Humidifier 500ml

Product ID: 177209868

Details

Brand
SMARTDEVIL
Special Feature
Night Light
Color
White
Floor Area
10 Square
Operation Mode
Ultrasonic

🌙Night Light Function

💧500ml Capacity

🔇Whisper-Quiet <30dB

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AED 6

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Description

💨 Elevate Your Air Quality, Elevate Your Life!

SAFETY FIRST - Automatic shut-off feature ensures peace of mind when water levels are low.
SILENCE IS GOLDEN - Enjoy a peaceful environment with whisper-quiet operation below 30dB.
LIGHT UP YOUR NIGHT - Choose between constant and breathing night light modes for a soothing ambiance.
VERSATILE SPRAY MODES - Switch between continuous and intermittent spray modes for customized humidity.
BREATHE EASY LIVE EASY - Transform your space with a 500ml capacity that keeps the air fresh and humidified.

The SMARTDEVIL Small Humidifier is a sleek, 500ml ultrasonic device designed for optimal air humidity in bedrooms, offices, and more. With whisper-quiet operation, a dual night light feature, and safety mechanisms like auto shut-off, it’s the perfect companion for a comfortable living space.

Specifications

Shape	Rectangular Prism
Color	White
Item Weight	236 Grams
Item Dimensions D x W x H	3.74"D x 3.74"W x 5.08"H
Room Type	Bedroom,Office,Room
Voltage	5 Volts (DC)
Runtime	12 hours
Power Source	USB POWERED (No Battery)
Control Method	Touch
Wattage	5 watts
Capacity	500 Milliliters
Floor Area	10 Square Centimeters
Operation Mode	Ultrasonic
Special Features	Night Light, Auto Shut Off

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