The critical turning point to the success of e-commerce business, including the front end of the platform with abundance, convenient design, and price advantage; the back end - how the system can rapidly react and shorten the lead time for the customer from ordering all the way to receive the shipment, is the crucial factor in winning the game. The pick to light system usually plays a role as the final mile of a journey by assisting an operator to speedily and precisely pick and dispatch the products.