16 Led COB (Chip On Board) high-brightness white (50lumen). 4 mode fixed: power eco (15%), normal power (30%), medium power (50%), maximum power (100%).4 mode is intermittent: intermittent with normal output intermittently with average power, intermittently, with maximum power, intermittent fast with average power. Splash-resistant (certified IPX4). Battery rechargeable lithium polymer battery (3.7 V/500mAh). Up to 44 hours of battery life. Rechargeable via USB, cable included. Charging time: about 3 hours.