The Con-Tec SAFETYLIGHT TWEET USB front light with USB charging and a lithium battery. Usage time: bright light 2h, constant 8h, flashing 48h, pulsating 10h. The light has a charge indicator, and it has an ultra-light, compact and high quality design, splash-proof. Light modes: bright, steady, flashing, pulsating + various attachment options without the need of using tools.