If you've made a Star Trek costume from a turtleneck and a pair of black pants, you'll want some Star Trek accessories to look authentic. The first thing you'll need is a Comm Badge. Second, a working phaser is a must. An hour's work will provide all the costume accessories you need.
Glue the small felt circle onto the larger circle, making sure it is centered.
Snip a smaller triangle of fabric from the base of the silver felt triangle. Curve the triangle's tip. The shape should resemble the tip of an arrow.
Glue the fabric triangle onto the fabric circles, making sure it is centered.
Attach the Comm Badge to your costume with a safety pin.
Hot glue the toilet roll holder to the base of the remote control. Center the tube. This is the phaser's handle.
Paint the phaser handle gray. Paint the remote as well if it is not gray.
Hot glue the cat laser onto the side of the remote control so that the laser faces forward. The laser's on button should be in a position so that you can easily press it when you are holding the phaser.