Does this device have to use the timer? Can it stay on and off without using the timer? Is the the timer just an additional feature?

You do not need to use a timer with this device. Additionally, it has three heat settings: low, medium, and high.

What's the wattage for each setting hi/med/lo ?

Not sure wattage. I used in sub freezing (20*F) weather on lowest setting and had no fogging/dew on Nikkor Z20mm 1.8, Nikkor Z70-200 2.8, and a Tokina 14-28 2.8. Works well, surprisingly low cost. (I use a cheaply rechargeable battery bank)

Does this unit automatically turn off? i need a lens warmer that will last 4-5 days without turning off.

Only if your battery runs out. No thermostat… just constant heat settings

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🔥 Never Miss a Shot Again!

QUICK SETUP - Easily adjustable for lenses up to 80mm!
STAY FOG FREE - Keep your lenses clear and ready for action!
DURABLE DESIGN - Withstands extreme cold without breaking a sweat!
PORTABLE POWER - Connect to any USB power source for on-the-go heating!
VERSATILE COMPATIBILITY - Perfect for telescopes, cameras, and more!

The USB Lens Warmer is an essential accessory for photographers and astronomers alike, designed to prevent condensation on lenses and eyepieces. With adjustable temperature settings and a USB power supply, it ensures optimal performance in cold conditions, making it perfect for outdoor use. Lightweight and easy to install, this lens heater is compatible with a variety of devices, ensuring your gear stays fog-free and ready for action.

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€ 38.50

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Slovakiastore

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TrustScore 4.5 | 7,300+ reviews

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Power Source	Battery Powered
Finderscope	Reflex
Compatible Devices	Laptop, Power Bank, [Other devices with USB port]
Focus Type	Manual Focus
Item Weight	59 Grams
Objective Lens Diameter	80 Millimeters
Item Dimensions D x W x H	5.24"D x 2.17"W x 1.38"H

USB Lens Warmer, Lens Dew Heater Strip with Temperature Regulator, Condensation Prevention for Telescopes Camera DSLR Lens Telescope Eyepieces Less Than 3.15 inch (80mm) in Diameter

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