Wide application: Suitable for moisture-proof, anti-corrosion, and anti-mildew of cameras, lenses, stamps, antiques, and more. Perfect for Canon 40D with 18-200mm, 24-105mm, 24-70mm; Nikon D7000 with 18-200mm, 24-70mm, 24-105mm; Nikon D7000 with 18-200mm 24-105mm; Canon 5D2/7D/60D/550D/600D; Nikon D90/D7000/D800/D600 etc; 18-200/70-200/24-70/18-135mm etc. Using: First adjust to the E gear and wait for the humidity to drop to about 40%, then adjust back to the D gear. For the first time using, keep the box empty and adjust to E gear and run it for one night. E gear is the maximum power and A gear is the minimum power. If you feel the humidity is high, increase the power, if humidity is low, decrease the power. Occasional fine-tuning to keep in optimal rangeDC input power supply eliminates the risk of leakage, providing a safe usage environment. With a patented dehumidification core, free from compressor, fan and radiation. It operates quietly without noise and heat effect, maintaining even RH values within the cabinet. The case is constructed with a durable aluminum frame and safety glass, being lightweight and aesthetically pleasing. Equipped with a temperature sensor of fast response speed, enabling rapid recovery after flooding or condensation, and featuring five-speed precision control range with stepless adjustment for the dehumidification range from 25%RH to 70%RH.