Auto Shut Off electric air pump is equipped with optional units including Built-in pressure gauge and pressure preset function, this air compressor will pump accurate amount of air and automatically stop inflating when the tire pressurereaches to the preset value, offering you a safe, quick and reliable using experience. Large Capacity & DissipationThis portable tire inflator with bulit-in 2000mAh large capacity lithium battery which is powerful for inflation and can continuously work for 40 minutes. With a built-in fan, to provide good heat dissipation, so it canwork continuously and never get hot. LED Light & Digital DisplayThis bike air pump has a HD LCD digital screen with backlight to clearly display the pressure value even at dark places, which is easy for you to check the pressure at anytime. With a built-in super bright LED light, itcan provides you with convenience for emergency lighting, bringing you a bright field of view so that you wont have to worry about replacing parts in dark places while traveling.