Temperature Control Camera Lens Heater USB Interface Condensation Heating Anti-Fog Telescope Camera Heating Seat Prevention Features: Brand new and high quality Specially designed for camera lens and telescope. Keeps your camera or telescope lens warm to prevent condensation With low, medium and high heating modes. Powered by external USB power supply. Adopts a low temperature cable can with a stand temperature of -40℃. Hook and loop closure makes installation and removal quick and easy. Specifications: Material: Diving Cloth Length: about 39-48 cm/15.35-18.89 inch (length varies by batch) USB cable length: approx. 85cm/33.46" Package Includes: 1x Lens Heater Note: 1.Please allow 1-2cm error due to manual measurement. Please do not mind before ordering. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.