This hand pressure power generation, do not need any battery and is environmental-friendly. The special thing is: it can be used in the environment of 90% humidity, the humid environment has no effect on the torch, in the mine, caves, forests, sea sailing, space and other special circumstances no need to worry about running out of power, gently hand press could charge, convenient, fast and practical. And it has a long life. This LED can be used continuously for 15,000 hours, the battery can be pressurized 600,000 times.