100% compatible with Pentax E remote control and F remote control. It can trigger your camera shutter release remotely from about 5-10merters(depend on the condition). The compatible camera has a built-in Infrared receiver for that remote triggering device. Use this remote control as a remote shutter release for self-portraits or to prevent blur caused by camera shake. Buttons: S for Shutter W/T for Zoom function( doesnt work with DSLR/SLR camera) Pentax Remote compatible with:MZ6,MZ-L,ZX-L ,Gx-1L, Gx-1S, Gx-10, Gx-1L, Gx-1S, Gx-10 (Samsung Cameras)*ist DL *ist S *ist D *ist DS2 DL2 K110D K100D K10D,Optio S, Optio S4, Optio S4i, Optio S5i,Optio S5n, Optio SV, Optio 330, Optio 430,Optio 450 Optio 550 Optio 555 Optio 750z Optio S50,Optio S40