The Acebeam M50 is an Micro-USB rechargeable aluminum keychain light that is available with three different LEDs (SAMSUNG LH351D / OSRAM KW CSLNM1.TG / NICHIA 219C). The Samsung LH351D LED provides 200 lumens for super bright with such a small and compact size of the M50. The OSRAM LED produces a beam that throws further for those looking for a beam that can cover more distance.The Nichia 219C LED option which provides a 90+ CRI rating for true-to-life color rendering perfect for those accustomed to warmer beams or are looking for a beam that won't wash out any color especially for critical electrical, mechanical, or medical work. Acebeam M50 only requires you to twist the light to access either the low or high modes. Fully tighten the lens to get high mode or simply loosen slightly for low mode. With the micro-USB recharging, the light will be full charged within 1 hour!