[Flexible Dew Heater]: Exceptional cable flexibility down to -25, proven by field tests. The neoprene strip is soft enough that you don't need to worry about wrapping it around your lens. [Material]: Made of premium Neoprene(Diving Suit Material),it helps prevent heat loss in the atmosphere, making heater power efficient, keep the lens dry and take the long exposing pics at cold night successfully. [Fast Warming]: Super fast and continuous warming system, and intelligently reach 167 F; The heater also has a temperature regulator on its power cable offer 3 incremental levels of temperature adjustments. [Portable Use Port]: The lens heater is equipped with USB port, just plugged in via USB to a power bank or other power source. Super and convenient for backyard astrophotographers. Adhesive strap fastener makes it easy to be attached and removed. [Specification]: 2.0A input current; 5V output voltage. Different batches may have different appearances, but will not affect the use Colour:Black Material:Neoprene Package Contents: 1 x Lens Warmer 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 picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.