1. Adopt infrared weld technology which is developed independently. 2. Use infrared heat lamp. Heat is easy to pierce and distribute evenly, which overcome disadvantage (burn out elements) of traditional welder machines. 3. Easy operation. Just need one-day training, you can operation it skillfully. 4. Don't need weld tools. Irda welder t870 can weld all the elements between 35x35-50x50mm. 5. This machine has 800w hot-melt system. Its preheating area is 240x180mm. 6. Infrared heating don't have sirocco flow. Don't impact circumjacent small elements. It is suitable for all of the elements. It can be used to unsolder bgasmdcsplgaqfp and plcc, especially micro bga and smd elements. 7. Definitely satisfy bga unsoldering/repair of mobiles, computers, notebooks, the electronic game machines and so on; especially suits to the computer north and south bridge chip 1 machine/1 ctn