Power Cord won't stay connected

No instructions how to open & what kind of batteries to use. Nor what ubs is needed. Just the product & the card in the plastic shield. Finally got it to work. Not as powerful as I'd hoped. Using for art work (acrykic dutch pour).

I mainly purchased this item because I am a dishwasher at a restaurant and thought this would help me dry the dishes quicker. I didn't want to buy and use an actual blow/hair dryer for this purpose because the electrical cord is a safety hazard around the water and sanitizer. It seems perfect to help with drying dishes though because it is not too clunkily and cumbersome like most hand-held blowers/dryers are. It seems to be just the right, practical size and put out the minimally necessary air pressure to help with drying! I'm glad I purchased it! Work smarter!

My son was very excited to have this as a gift. Works to the expectation of type of toy. Great service and very prompt with delivery.