This remote pressure switch is designed for the WF-501B flashlight. It allows you to control your torch with convenient line operation. Function: Remote Pressure Switch Compatible Models: WF-501B LED Flashlight Fits flashlights with a similar metal case design Size: 3cm x 2cm x 2cm (1.18in x 0.78in x 0.78in) Diameter of Remote Pressure Switch: 23.5mm Material: Aluminum, plastic Color: Black Note: Before purchasing, please verify that this switch is compatible with your flashlight model, as variations may exist in the market. Package Includes: 1 x Remote Pressure Switch for 501B The package includes only the items listed; other accessories are not included. Note: Lighting conditions and monitor settings may cause slight variations in color between the product image and the actual item. Measurement tolerance is +/- 1-3cm.