The MAXOAK Model K 82500mAh Power Bank is a versatile power supply with a nominal voltage rating of 25.2V/3A DC and 100-240V AC, suitable for various electronic devices but purpose-built for quiet operation as a portable CPAP power bank. It features an LCD display, and multiple protection properties including overload and overvoltage protection. The power bank has a capacity of 82500mAh, providing a long 40-50 hour backup time, and comes with a new variable 24V/3A DC charger for convenience. With a compact and portable design, this power bank is ideal for indoor use and offers reliable power supply for equipment such as CPAP machines. Supports USB Out for continuous charging of your tablet, smart phone, or LED devices. Comes fully charged. Tested and working.