Mlay laser has a very high cooling feature for use. The reason for selling is lack of sufficient time for use. I didn't continue with it and decided to sell it. There is no defect or anything. The number of flashes is shown in the picture. The device will last you. You can change the lens with a new lens from the Mlay company website. Accessories include a full body lens. Purchase price: 1000. Selling price: 550. Reasonably negotiable.