Homoyoyo 2pcs Lens Heater Condensation Prevention Lens Warmer Lens Warmer Strip Milk Bottle Warmer Heater for Telescope Dew Heater USB Heater Heating Wire Camera Lens heater warmer-- hook and loop fixed, the tightness can be adjusted according to needs. Camera lenses-- suitable for viewfinder lenses, digital cameras, telescopes, milk bottles, and etc. Color: Black Size: 38x6.5cm Lens heater warmer-- hook and loop fixed, the tightness can be adjusted according to needs. Camera lenses-- suitable for viewfinder lenses, digital cameras, telescopes, milk bottles, and etc. Warmer for bottle heating-- USB powered design, you can power this warmer with power bank, wall socket, laptop, and etc. Heater for condensation prevention-- can be used to protect camera or telescope lens from fogging and freezing.