The package comes with a BiXPower super high capacity (159 Wh) lithium ion rechargeable battery pack that can provide 19V DC power for laptop notebook computers and a 24V DC converter specially designed for ResMed AirSense 10 machine. It may add 6 ~ 10 hours extra running time for most laptop/notebook computers, 15 ~ 30 hours extra running time for most ultra-books & tablets. It may power ResMed AirSense 10 CPAP machine 2 ~ 3 nights with the humidifier turned off. This battery has 159 Watt-Hour rated capacity while most laptop internal batteries only have around 40 - 60 Watt-hour capacity. If we rate this battery capacity like many other brand external batteries on market, this battery capacity is 44000mAh. We suggest using "Watt-hour" instead of "Amp-hour" to compare capacities of different batteries. Watt-hour or Wh, is a more accurate unit to show the power capacity than Amp-. Hour (Ah). Made with high quality Li-ion battery cells. 24V DC converter specially designed for ResMed S10 CPAP Machine can convert the battery output voltage to 24V DC power. Battery itself is compatible with many laptop notebook computers. 5V USB port may power many small devices such as smart phones, tablets. Compact size can easily fit into a laptop/notebook carry bag. Comes with AC charger and Car charger. AC charger can charge the battery from 100V ~ 240V AC power outlets from home & office. Car charger can charge the battery from a car cigarette lighter socket. Can accept wide range input charging voltage ( 12V ~ 19V). You can use the battery while it is charging. Advanced circuits inside provide many safety protections. 12 popular interchangeable connectors (may change from time to time without notice) including connectors for many popular laptop computers. More optional connectors are available from BiXPower.