Use this flash trigger to make the main flash remotely control the auxiliary flash synchronously without the need for connecting cables To sense the light from the main flash to wirelessly trigger the slave flash Works with most flash units that use a universal flash shoe like, , , (except for flash) This slave trigger does NOT fit for / / flash The wireless flash remote trigger for flash shoe uses optics to make the main flash remotely control the auxiliary flash synchronously without the need for connecting cables. It is small in volume, neat in appearance, high in flexibility, and stable in performance, it can also artificially create various types of effects. Material: ABS + metal Package Contents: 1 x Wireless Flash Remote Trigger for Flash Shoe 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 to be a little different from the real thing. The allowed measurement error is +/- 1-3 cm.