Wein HS-XL Hot Shoe Slave (600' Range) for Digital Cameras Range up to 600 feet Built-in ambient light filter for outdoor use. Attach directly to foot of any shoe-mount flash - no other connection necessary. Constructed of aircraft aluminum and solid epoxy; virtually indestructible. Integral 1/4-inch - 20 threaded socket for tripod, monopod or light stand mounting.