The only thing this feature-packed Orion Dynamo 12-volt rechargeable field battery doesn't do is make toast! Our Dynamo Pro 17Ah Rechargeable 12V DC Power Station is a conveniently portable power supply you can take with you into the field to power motorized GoTo telescopes, astrophotography cameras, powered astronomy accessories and more. This 17Ah (amp-hour) model works just like our popular Dynamo Pro 12Ah field battery, but provides 40 percent more power storage! The Dynamo Pro 17 is a portable DC power supply featuring two 12-volt cigarette lighter or auto-lighter style output ports (10 amps max.). The Orion Dynamo Pro 17 Ah enables you to power your astronomy gear during long observing and/or astrophotography sessions in the field. Two convenient 5V USB outputs are also built-in to provide power to USB devices and adapters. It's fully rechargeable, and includes 110V and 12V DC charging adapters. The included, interchangeable 110V-240v AC adapter plugs for UL (US style plug, 110V/60Hz), BS (230V/50Hz) and Europe (230V/50Hz) standard voltage AC outlets provide international versatility. A helpful indicator light tells you when the battery needs recharging. The Orion Dynamo Pro 17Ah Rechargeable Power Station has a host of other handy features built-in, such as a removable red flashlight with 11-foot cable and magnetic mount, a very bright white LED spotlight (ideal for picking up astronomy gear after a long observing session), an AM/FM radio, and a circuit breaker fuse to ensure safe operation. You can even attach jumper cables to the Dynamo Pro to help revive a dead battery. With so many useful features, you'll find the Dynamo Pro 17Ah indispensable not only for observing sessions, but also around the house, yard, and in vehicles for emergency situations. The Orion Dynamo Pro 17Ah Rechargeable Power Station weighs 16 lbs., 8 oz. Regular recharging is required for optimal use.