The Yamaha EF1000iS inverter generator is the ultimate in lightweight portable electricity that is quiet, durable and convenient. Designed to supply high-quality and clean power, the EF1000iS was built to be quiet and durable. Designed with an all-new ergonomic style and fitted with a compact alternator and inverter unit, the EF1000iS weighs in at a class-leading 27lbs, making it extremely portable. Noise Block, acoustically designed sound reduction system helps to make the EF1000iS the quietest portable generator in its class. The EF1000iS� lightweight, powerful, clean and quiet. A powerhouse performer at your fingertips. Lightweight Design / Easy to Carry Recharge 12 volt batteries for RV, auto, marine, aircraft, etc. MAXIMUM AC OUTPUT 1000 watts RATED AC OUTPUT 900 watts RATED / MAXIMUM AC CURRENT 7.5 / 8.3 CONTINUOUS OPERATION AT 1/4 RATED LOAD 12.0 hrs. NOISE LEVEL (1/4 LOAD / FULL LOAD) 47dBA - 57 dBA