This is a nice full size commercial style sprayer that will hold 4 gallons of weed kiler, fertilizer, etc. The only issue is the directions, which are unclear in how to attach the backpack, but we got it figured out. The rest of the system is easy to manage and put together. My biggest like, the nice 4 inch filling cap, which means no spills! You can dump gallon jugs into this and not have it run all over. A large red power switch is on the side, letting you turn it on and off while wearing it. The wand has a big handle and lever, letting you use this with gloves. This sprays the entire four gallons on one battery back and has lots of life left. The battery mounts to the back of the machine, with a water resistant cover. The battery does have a power gauge. I counted three different changeable nozzles with different spray patterns, with a variable adjustable nozzle as well allowing for on the go stream changes. Overall this is a great machine, it fits well on the back, the wand and hose are long and each well, and the motor isn't loud at all, it just hums. I recommend it!