With this amazing Portable Air Compressor, you won't need to hoard any more quarters to pump up at the gas station! This air compressor comes with an internal rechargeable battery, so it is always ready when you need it. If it gets depleted while in use, you can plug it in to a power source via the USB port and keep filling up. Spec: Working voltage: Home adapter 5V ; cigarette lighter 5V. Current: 5A Inflating Speed: 12L/Min The maximum inflation pressure: 120PSI Battery capacity: 500mAh×4= 2000mAh Operation temperature:-20?60? LED flashlight: Bright light Display Units: KPA, PSI, BAR, KG/CM Product size:2.17"X2.17"X7.87" Weight:0.8 pounds Inflator efficiency: inflate a mountain bicycle tire from 0-70psi in 1 minute.