This package comes with Two BiXPower BP90 high capacity rechargeable battery power bank and a Y25 split dongle that can combine two batteries together. A special cable specially designed for a ResMed AirSense 10 CPAP machine. Each battery capacity is 96 Watt-hour. Two battery combined capacity is 192 Watt-hour that can power ResMed AirSense 10 CPAP machines for 2 ~ 3 nights with the humidifier turned off. You may use each battery separately, or use them together with provided split dongle. Each battery capacity is 96 Watt-hour, two batteries combined capacity is 192 Watt-hour, It can power ResMed AirSense 10 CPAP machines for 2 ~ 3 nights with the humidifier turned off. Easy to carry. Light weight: each battery weighs only 1.4lb (or 620 g). Compact size: Single battery dimension: 186 x 114 x 22.5mm (7.5" x 4.5" x 0.9"). According to FAA current regulations, Lithium ion rechargeable batteries with capacity 100 watt hours (Wh) or less per battery are allowed with the passenger in carry-on baggage, but are prohibited in checked baggage. In this pack, each battery capacity is 96 Watt hour, so they should be allowed to be carried with you when you travel by air. Batteries can be charged from 100V ~ 240V AC power source, or a 12V car cigarette socket. Batteries has built in charging controller, can charge from many DC power source, such as 12V or 18V solar panel. This battery pack works with the following CPAP Machines: AirStart 10, AirSense 10, and AirCurve 10 machines manufactured by ResMed. It may work with many other CPAP machines that need 24V power and use the same size power connector.