HALO Multi-Sport Helmet and Protective Knee and Elbow Pad Combo Set. Helmet includes an adjustable head-ring to ensure a snug fit! Protective knee and elbow pads have matching color caps to the helmet! Helmet head sizing ring also features a safety light with 3 modes! Simply press down the button located on the safety light to activate the light. Pressing the button down once activates "Mode 1" which is where the red safety light stays on solid until turned off. Pressing the button again with activate "Mode 2" which is a Blinking Light! Pressing the button a third time activates "Mode 3" which is where the light moves up and down the safety light to catch the attention of anyone behind the rider. Pressing the button a fourth time turns the safety light off.