Bluetooth is a proprietary open wireless technology standard for exchanging data over short distances (using short-wavelength radio transmissions in the ISM band from 2400–2480 MHz) from fixed and mobile devices, creating personal area networks (PANs) with high levels of security. Y 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 The Blue Angel is the ecolabel of the federal government of Germany since 1978. The Blue Angel sets high standards for environmentally friendly product design and has proven itself over the past 40 years as a reliable guide for a more sustainable consumption. Blue Angel 2 paper trays 2 Laser technology Laser HP LaserJet Enterprise M507dn, Laser, 1200 x 1200 DPI, A4, 43 ppm, Duplex printing, Network ready HP LaserJet Enterprise M507dn. Print technology: Laser. Number of print cartridges: 1, Maximum duty cycle: 150000 pages per month. Maximum resolution: 1200 x 1200 DPI. Maximum ISO A-series paper size: A4. Print speed (black, normal quality, A4/US Letter): 43 ppm, Duplex printing. Display: LCD. Network ready, Wi-Fi. Product color: White