Points: 1,Safety Protection: Protect your digital camera lens or viewfinder from freezing due to cold fog and dew, allowing the device to work at night where temperatures drop or weather is inclement. 2,Three-speed Temperature Control: This lens dew heater comes with three-speed temperature control of high temperature about 55C (131F) ~65C (149F), mid-range temperature about 45C (113F) ~55C (131F), and low temperature about 35C (95F) to 45C (113F). 3,USB Port Design: It's easy to use because you can connect it to a portable power supply or any other power supply with a USB port. 4,Wide Range of Application: This dew heater is adjustable in diameter and easy to stick, suitable for most sizes of telescopes, viewfinders, digital cameras, etc. 5,Hook and Loop Fastener: The defogging band is secured by hook and loop fastener, which not only allows the defogging band to fit your lens, also allows you to quickly detach and adjust the length you need. Specification: Colour: Black : cloth Product size: about 28cm x 6.5cm x 0.5cm/ 11.02in x 2.56in x 0.20in Product weight: about 80g Package Contents: 1 x USB Dew Heating Strip Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.