This is a Dass Magnum-600 foot pump, which is a type of portable air compressor used to inflate tires and other items. 
It is a foot-activated pump designed for inflating car, bike, and bicycle tires, as well as sports balls and inflatable furniture. 
The pump features an integrated pressure gauge to help you monitor the inflation level. 
It is described as being lightweight and portable, making it convenient for use in emergencies or when you are away from home. 
The pump is often sold with special adapters for different valves, such as those found on bicycles and inflatable toys.