At the beginning of the product development, the customer proposed to want a small flashlight with strong portability and high brightness. After repeated communication, it was decided to develop an all-round small steel cannon-level work. The LED uses 4 XHP50-2 high-performance lamp beads, and the battery uses a short and compact 26350 power battery, so the total length of the successful handle power is controlled to about 8cm. Later, the customer suggested that it might be more convenient to be compatible with 18650,21700 and 26650 batteries. In addition, using an LED lens with high light transmittance can give users more choices. With such twists and turns, this product (essentially two) was born. Interestingly, the promotion side has pushed the long version as the main version and the short version as an addition. Once this product was pre-sold, it received very good popularity. Orders are close to 1000 in less than January.