The OLIGHT H15S Wave is an upgraded version of H15 intelligent head lamp. With the latest CREE XM-L2 LED, the maximum output has increased to 250 lumens. H15S Wave has a specially configured, high-capacity, 1200mAh 3.7V lithium polymer battery pack for longer runtimes. The H15S has three output modes (Low, Medium and High) and an optimized user interface for easy access. It can be configured to either use the switch or infrared hands-free sensor to turn the light on and off. Features: IR Sensor: The H15S Wave is equipped with an infrared (IR) sensor1200mAh Rechargeable battery: The H15S features a high-capacity, rechargeable lithium battery with built-in charger. Built-in Filter: A built-in filter has been designed for lighting close distances. Light Weight: The H15S weighs only 98g without the battery. Multiple Brightness Levels: Three brightness levels with a maximum of 250 lumens of output lets the H15S accommodate to almost any situation. The Medium brightness level at 100 lumens is often bright enough for most nighttime tasks and the 15 lumen Low has an astounding 36 hours of runtime! Adjustable Angle: The light source can be angled up to 75 degrees to aim the light where you need IR Sensor: If the IR sensor is left on with the power off for over an hour, the H15S will automatically put the IR sensor in standby to conserve battery life.H15S Operation using the IR Sensor and Mechanical Switch.