3 in 1 rechargeable & automatic emergency fan, duration - 11 hours (low speed), 6 hours (middle speed), 4 hours (high speed), dc & ac power supply available with high powered led light, usb function, 3 blade functionality for efficient airflow, charging & full charge indicator light, over-discharge & overcharge protection, 3-step speed control, automatic oscillation, touch & tilt neck, extra low noise & durable motor, portable handle offers convenient indoor & outdoor use