Welcome to our store! 1. Adopts a 37mm lens design for mobile phone clips with strong clamping, enabling the installation of any other 37mm filters. 2. ND2-400 ND filter with 1-9 adjustable gears to reduce light, providing more exposure options for your photography. 3. Made of high-quality optical glass and a lightweight aluminum filter frame for high light transmittance. 4. Primarily used to reduce the amount of light entering the camera, extending exposure time and effectively reducing shutter speed. 5. When facing strong light and needing longer shutter speeds, the ND filter can reduce the amount of light entering the lens, allowing for longer shutter speed photography. Specification: - Item Type: ND Lens Filter - Material: Plastic + Aluminum Alloy - Color: As Pictures Shown - Weight: Approx. 33g Package List: - 1 x ND Lens Filter (installed) - 1 x 37mm Lens Clip 100% Satisfied: Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We will do our best to provide you with satisfactory after-sales service.