Product Description from the Manufacturer

The Yamaha EF1000iS inverter generator is the ultimate in lightweight portable electricity. It is quiet, durable, convenient, and supplies high-quality, clean power. Designed with an all new ergonomic style and fitted with a compact alternator and inverter unit, the EF1000iS weighs in at a mere 27 pounds, making it extrememly portable. This lightweight unit doesn't stop there. Built with sound absorbing material and featuring a newly designed muffler on a revolutionary Yamaha MZ50 engine, the EF1000iS is both powerful and extremely quiet. The EF1000iS is lightweight, powerful, clean and quiet. A powerhouse performer at your fingertips. 2-year limited warranty.

Source from Amazon