This remote pressure switch is especially designed for -501B Flashlight. With this switch, you are to line control your Torch. Function: Remote Pressure Switch Compatibility Models: -501B LED Flashlight Suit for flashlight which has the same metal case design Size: 3cm x 2cm x 2cm - 1.18inch x 0.78inch x 0.78inch Diameter of Remote Pressure Switch: 23.5mm Material: Aluminum,plastic Color: Black Notice: you this item, make this switch fits your torch, because some versions of the torch in the market might be different Package Contents: 1 x Remote pressure switch for 501B Only the above package content, other products are not included. Note: Light 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. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.