Lens warmer. This practical lens warmer protects your cameras or telescopes from ice, dew and fog. It is perfect for taking photos in the morning or winter at different temperatures. USB cable. You only need to connect the USB cable to a power bank or external battery to quickly free the lens of dew and fog. Technical features: Length: 37 cm. Width: 8 cm. Heating length: 22 cm. Strap material: neoprene and polyester. Heating material: carbon fibre heater. USB cable length: 1.5 m. Velcro length: 12 cm. Note: 1. Store the product in a cool and dry place and do not expose it to direct sunlight. 2. Never try to dry it with the microwave or other such appliances. About COOWOO COOWOO has a professional, young and passionate customer service team. We stand for high quality products at reasonable prices and have customers worldwide. COOWOO Customer Support We will ensure that you are completely satisfied with our product. If you have any further questions, please send us an email. We are here to help you.                                                
 About this item 
                      
  
 SUPER FAST & CONTINUOUS HEATING With fast start of 5 seconds to heat up and intelligently reaches 50°C the maximum at actual needs, while keeping the average temperature at 30°C.  
  
 Protects the lens of your digital camera or finder scope from freezing by cooling mist and dew, so the devices work properly at night when the temperature drops or is placed in bad weather.RR PA20232023Great idea for warming up water bottles, drinking cups, vials or anything that needs to keep warm.  
  
 Can be surprisingly used as a special wrist strap/knee brace to protect it from cold weather or emergencies at low temperatures that heat passes through your whole body from where you attach it.  
  
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