A professional ND filter with phone clip, compatible with most smartphones on the market, can reduce the light getting into lens and slow shutter speed, perfect for moving object photography like water flow, cloud, traffic stream, and more, helping to shot professional and wonderful photos with smartphone. Features： With broad compatibility, this 37mm ND filter is suitable for most smartphones on the market. Can reduce the light amount getting into the lens and slow shutter speed, shooting more professional and wonderful photos just with smartphone Adjustable density filter from ND2 to ND400, satisfying your various photography needs. Perfect for moving objects photography like flying bird, flowing water, clouds, traffic flow, and more, also suitable for human stream photography. Comes with a phone clip for easy and convenient installation and use; mini size and light weight, convenient for storage and carrying. Specifications： Color: Black Material: Optical Product Size: 4 * 4 * 1cm/ 1.5 * 1.5 * 0.39inch Product Weight: 30g/ 1.05oz Package Size: 8 * 5 * 5cm/ 3.1 * 1.5 * 1.5inch Package Weight: 40g/ 1.4oz Package List： 1 * ND Filter 1 * Phone Clip