Power your PAP device when and where you need it. Perfect for camping, airline travel, and use as a backup power supply during power outages so your PAP therapy will continue uninterrupted. Included sine wave power inverter allows the Freedom CPAP Battery to power certain PAP device models including ResMed S8, Fisher & Paykel ICON, Transcend, 3B Medical and Apex Medical models. See below for compatibility and run time details. Charge other small electronic devices such as cell phones, MP3 players andtablets. Battery features a 5V USB port and the sine wave power inverter features a three-prong plug and two 5V (1A and 2.1A) USB ports. Use the included sine wave power inverter to charge the Freedom CPAP Battery in a vehicle. The vehicle does not need to be running during the charging process; however, when charging any electronic device or external battery in a vehicle, it is recommended that the vehicle be running during the charging process to prevent draining the vehicle's battery. Easy-to-read digital display screen shows remaining charge level and it charges to full capacity in 4 hours when completely discharged. Optional accessory available to charge the Freedom CPAP Battery by using the power of the sun. Kit Includes: Freedom CPAP Battery, 150W Sine Wave Power Inverter, AC power supply, DC power pigtail cord, connector tips, DC input cord, and user's manual. 1 year manufacturer warranty.