The Hoovy Stoller Fan with Flexible Tripod Clip features a Rechargeable USB Battery. This battery can run for up to 30 hours on a full charge. The Hoovy Stroller Fan is both handheld and portable and features 360 degree rotation as well as 3 fan speeds (Low Medium High). The Hoovy Stroller Fan was designed for baby as it can easily fit in diaper bag or backpack and is super quiet in use so no worries about waking your baby. In addition the battery can serve as a power bank with a built-in charger for your phone or other electronic device