These Light Sticks are primarily designed as emergency signalling devices. Each Light Stick lasts for up to 15 hours (green/orange) or 8 hours (white). They come in both green and orange or white colours. To activate just bend, snap and shake thoroughly. Full glow will just take a few seconds. 2 x 15 hour (green/orange) or 2 x 8 hour (white) light sticks (foil wrapped), 1 green + 1 orange stick or 2 white sticks, lanyard included with each stick, safe: non-toxic & non-flammable, material durable Polypropylene.