This electric balloon pump is designed with two operation modes, one automatic and one semi-automatic. Please choose the right mode for different balloons. If automatic mode is too fast, then please choose semi-automatic(press-on) mode, which will avoid blowing balloons burst. When using semi-automatic mode, just simply plug in the pump, leave power switch to "off" position and press the nozzle to inflate. If stop pressing, inflation will stop as well. Please be aware that this product will only fill the balloons with air, not helium or hydrogen. The best suitable for advertising balloons promotional activities and balloon decoration and festive scene layout, the inflation rate is fast, simple and flexible operation, switch control inflation, classified as continuous and touch-on two patterns, the appearance of lightweight, portable design. Choose this and create a warm atmosphere for the party and enjoy the nice time.