【Effective 16"/400mm Heater Length】 Eliminate dew, fog, and condensation with our specially crafted lens warmer during cold weather photography. For optimal performance and even heating, it is recommended to use on lenses or telescopes with a circumference of up to 15"/375mm and a diameter of 120mm
【USB Power Source】 Plug into a USB power adapter, a portable charger, or other power sources that offer a USB 5V 2A output. The 4.9ft/1.5m long USB cable makes the heater ideal for indoor and outdoor use
【3 Temperature Levels】 A temperature regulator offers 3 settings (High Mode: 55-65°C; Middle Mode: 45-55°C; Low Mode: 35-45°C) to suit different weather environments
【Touch Fastener Design】 With handy touch fasteners, the heater can wrap around your lens or scope with security and is easy to adjust
【For Other Applications】 As a multipurpose heater with a whole length of 20"/500mm (including the fastener part), it can also keep your baby bottle and coffee cup warm in winter days, or warm up your wrist, elbow, and ankle when they feel cold
