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 When performance is your priority, rely on proven, trusted technology. With the cylindrical lithium-ion battery cell your laptop gets stable power that’s great for high-performance devices. Lithium-Ion (Li-Ion) Legacy Intel® Core™ Processor Intel Core i3-2xxx Numeric keyboard Y Hard Drive HDD HDMI 1 DIRECTIVE (EU) 2022/2380 OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 23 November 2022 (Part III) y HP ProBook 4540s, Intel® Core™ i3, 2.4 GHz, 39.6 cm (15.6"), 1366 x 768 pixels, 4 GB, 320 GB HP ProBook 4540s. Processor family: Intel® Core™ i3, Processor model: i3-2370M, Processor frequency: 2.4 GHz. Display diagonal: 39.6 cm (15.6"), Display resolution: 1366 x 768 pixels. Internal memory: 4 GB, Internal memory type: DDR3-SDRAM. Total storage capacity: 320 GB, Storage media: HDD, Optical drive type: DVD Super Multi DL. On-board graphics card model: Intel® HD Graphics 3000. Operating system installed: Windows 7 Home Premium. Weight: 2.47 kg https://www.notebookcheck.net/Review-HP-ProBook-4540s-Notebook.85978.0.html The name ProBook stands for entry-level business laptops. After we tested the 17-inch ProBook 4740s from HP's new ProBook 4X40s range, the 15.6-inch ProBook 4540s series model follows. The 4540s line is the direct successor of the 4530s range. We reviewed... Good application performance, Good maintenance and upgrade options, Good keyboard, Two operating systems (Windows 7 + 8), Device's low temperature, Security features Only twelve month warranty, Too loud in idle Courtesy of. Read all 28 comments / answerstatic version load dynamicLoading CommentsComment this article...