ENERGY STAR® is the government-backed symbol for energy efficiency, providing simple, credible, and unbiased information that consumers and businesses rely on to make well-informed decisions. ENERGY STAR is the simple choice for energy efficiency, making it easy for consumers and businesses to purchase products that save them money and protect the environment. ENERGY STAR DELL 2155cn, Laser, Color printing, 600 x 600 DPI, Color copying, Mono scanning, A4 DELL 2155cn. Print technology: Laser, Printing: Color printing, Maximum resolution: 600 x 600 DPI. Copying: Color copying. Scanning: Mono scanning. Faxing: Mono faxing. Maximum ISO A-series paper size: A4