The Division shoulder beacon

Prop for cosplay from the game The Division.
Use two M4 screws to attach the antenna. Just push them through the body, apply some hot glue and push the antenna onto them. You'll probably need to drill the 4mm holes first.

The antenna's aerial is a plastic strip. I used hot glue to secure it.

The lens can hold 4 leds and the body's side has an opening for a small switch. There is space for 2xAAA batteries and wiring. Apart from that you need battery contacts 4 resistors for the leds and 4, about 3mm screws to hold the back.