This wide spectrum BLOS (Beyond-Line-Of-Sight) searchlight transforms the blue laser energy into broad-spectrum, divergent, safe and bright incoherent white light (BMW is using similar phosphor technology to create laser headlamps for their vehicles); generates a high concentrated single output of 500 lumens beam, and its beam can reach remarkable beam distance of 2408 meters away. The high-drain 21700 5100mAh USB rechargeable battery provides a runtime of 1 hour 45 minutes. The convenient USB charging function allows to charge the battery timely. An 18650 battery adapter is also included for wider battery options. The battery indicator tells the battery voltage status at any time any where. The included Red filter adds to versatility of the W30. Moreover, W30 can be used as a diving light with a depth under water 100 meters.