This remote pressure switch is designed for the WF-501B flashlight. It allows you to control your torch with a line switch. Function: Remote Pressure Switch Compatibility 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 Notice: Before purchasing, please confirm that this switch is compatible with your flashlight, as some versions may vary. Package Contents: 1 x Remote Pressure Switch for 501B Note: The package includes only the items listed. Other products are not included. Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement error allowance is +/- 1-3cm.