This is a battery rechargeable double discharge air pump that connects directly to USB. Can be charged and moved using household power supply (100 V-240 V) or USB power supply. Waterproof standard IPX-4 (waterproof for everyday use) so it can be used in rivers and oceans. The battery will automatically switch to a working battery even in the event of a power outage. Interval mode (energy-saving mode) that repeatedly turns on and off every 10 seconds. It can work for about 8 hours in normal and 16 hours in energy saving mode. Equipped with an LED meter that lets you know the remaining battery level at a glance. Comes with a stainless steel hook for convenient equipment such as a live bait bucket for fishing. Useful during power outages and disasters.