Usage Tips:This remote pressure switch is especially designed for WF-501B Flashlight.With this switch, you are able to line control your Torch.Function: Remote Pressure SwitchCompatibility Models:WF-501B LED FlashlightSuit for flashlight which has the same metal case designSize: 3cm x 2cm x 2cm - 1.18inch x 0.78inch x 0.78inchDiameter of Remote Pressure Switch: 23.5mmMaterial: Aluminum,plasticColor: BlackNotice: Before you bid this item, please make sure this switch fits your torch, because some versions of the torch in the market might be differentPackage Contents:1 x Remote pressure switch for 501BOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.