Electronic multi-function switch for 4 different light modes: Maximum light power (100%), energy saving mode (25%), blink mode, SOS emergency signal (three short, three long, three short). The different modes are selectable through fast turning of the lamp head (turning on & turning off) one after another. Light ray with high lamp intensity, focusable through turning of the lamp head. 10 years warranty on housing & reliability. The service life of the LED amounts to ca. 10, 000 h. Battery service life extended through eligible lamp steps.