The HL 160 provides 160 lumens of power; and will do so for 8 hours. Unscrew bottom cap to reveal protected micro USB and mini USB port for rapid charging. The 160 charges cell phones with USB Port and is less than 6" long and weighing only 4.5 oz. It is comfortably and functionally bright, waterproof (floats) plus incredibly durable. When the solar collector has discharged or dimmed, simply recharge using any light source (sun is best) but ambient or artificial light works too. For rapid charging the HL160 can be charged via wall, car, and micro USB Port. Store or use; and then comfortably repeat the process again as needed. The HL160 can be stored without sun for 7 years and still retain 90% of the original power. Guaranteed to work every time you pick it up and click! In short , the HL160 will find itself at the top of the most desired flashlights for all around use.