Troika's Eco Run is ideal for outdoor activities and happens to be Eco-friendly to boot. The Eco Run is rechargeable via any USB port such as your laptop and/or mobile phone charger (charging cable included). In case you find yourself on a dark road, the Eco Run has two light strengths and one blinking strobe light mode to let oncoming cars know you're there; on a fully charged battery, and depending on the mode, the Eco Run will remain one for three to five hours. Finally, the strong magnetic fastener of the body will ensure the Eco Run remains on you even in the midst of a rigorous run.