PEQ-15: The peq-15 has a red dot and an illuminator that actually has a good light output. The red dot can be adjusted for windage and elevation. It attaches on regular quad rails securely. The box has its own button to control the light and laser but it connects to the pressure switch. It also comes with a stand alone pressure switch, adhesive Velcro and a rubber band for more options. Surefire light: The light is very bright and has a good range, it attaches on quad rails and doesn’t move. A different end cap will be included so it can be used as a normal flashlight as well as an extra pressure pad, a rubber band and an adhesive Velcro strip for all different types of mounting. Pressure switch: It’s standard and both buttons work and connect to the peq-15 and flashlight, it’s not plasticky and doesn’t feel like a knock off, it feels sturdy and comfortable to hold onto. It comes with the hardware needed to mount it onto M-lock and piccatiny rails. I just bought these and have only opened them to photograph so they are brand new. Hit me up with questions, NO TRADES PLZ.