Free Shipping New Updated 2021 LED's & Tailcap Design! •Green Visible Strobe •Infrared IR Strobe (not Visible to naked eye) •Polymer Compact Build •Lightweight •Battery Included! *One press of the power button causes the helmet light to vibrate, and emit IR strobe. *Once powered on, hold the two buttons on the side & the VIS Green Strobe will turn on. Battery compartment is a snug fit with the Included battery to hold it in place. Takes a couple smacks to get the battery out :) Other colors (Red & Blue) Also Available! Free Shipping, feel free to ask any other questions & please check out my other items!