Specification:<br />Product name: Nitecore Tube UV 500mW 365nm USB LED Keychian<br />Max Run time: 1 h 0 m / 0.04 d<br />LED: Ultraviolet<br />Battery: Rechargeable Li-ion<br />Size: 2.22&amp;rdquo; x 0.83&amp;rdquo; x 0.31&amp;rdquo; (56.5mm x 21mm x 8mm