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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Kiwifotos 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

Product ID: 494825938

Details

Brand
Kiwifotos
Eye piece lens description
Plossl
Objective lens diameter
80 Millimeters
Optical tube length
3.15 Inches
Product dimensions
3.5D x 13.3W x

🔌USB powered for on-the-go

🌡️3 adjustable heat modes

🛡️Prevents lens condensation

€ 112.64

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Sold byAmazon SlovakiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌙 Keep your lens crystal clear—never miss a shot in the cold!

USB POWERED PORTABILITY - Plug into any USB power bank or device for uninterrupted outdoor use.
CUSTOMIZABLE WARMTH CONTROL - Choose from low, medium, or high heat to match any chilly environment.
UNIVERSAL FIT FOR LENSES 80 MM - Designed to snugly wrap around most DSLR, telescope, and camera lenses under 3.15 inches diameter.
RAPID HEAT TRANSFER INSULATION - Premium composite fiber and neoprene materials ensure fast warming and effective dew prevention.
EFFORTLESS INSTALLATION STORAGE - Hook-and-loop fastener for quick setup plus a sleek pouch for compact storage and travel.

The Kiwifotos USB Lens Warmer is a lightweight, portable dew heater strip designed for lenses and telescopes under 80mm diameter. Featuring three adjustable heat settings and powered via USB, it prevents condensation and frost buildup during cold outdoor shoots. Made with high-quality composite fiber and neoprene, it offers fast heat transfer and excellent insulation. Easy to install with a hook-and-loop fastener and includes a storage pouch, making it an essential accessory for nightscape photographers and astronomy enthusiasts alike.

Specifications

ASIN	B083NJCFCH
Additional Features	Temperature Regulator, Condensation Prevention, USB Power Supply, Adjustable Heating Modes
Brand	Kiwifotos
Compatible Devices	Laptop, Power Bank, [Other devices with USB port]
Customer Reviews	4.5 4.5 out of 5 stars (257)
Eye Piece Lens Description	Plossl
Finderscope	Reflex
Focal Length Description	3.15 inches
Focus Type	Fixed Focus
Item Dimensions D x W x H	3.5D x 13.3W x 3.5H centimeters
Item Weight	59 Grams
Manufacturer	Jinjiacheng Photography Equipment Co.,Ltd.
Manufacturer Part Number	DHS-1
Model Number	DHS-1
Number of Items	1
Number of Packs	1
Objective Lens Diameter	80 Millimeters
Optical-Tube Length	3.15 Inches
Power Source	USB Powered
Unit Count	1.0 Count

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

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