... railway,agriculture,forester,climbing.etc) 1. Portable IT and Digital Device:laptop,MP3,PMP,CD,Portable DVD,Portabe Printer,Portable TV ... ,Wireless Meet Spot,Blue-tooth Adaper 4.Portable Camping Device:Warm Stove,DC electric Fans,Lantern,Caution Light,Fishing ... Light.5.Portable Industrial Device and Portable Medical Treatment Device:Industrial Computer,X-ray Machine,etc.