The esysLight is a refreshable braille display designed for use by individuals who are blind or have low vision. This unit has a display with 40 braille cells with 40 cursor routing keys located above the braille cells. It can be used independently or connected to another device via Bluetooth or mini USB. The esysLight can be connected to a mobile phone, personal digital assistant (PDA), or personal computer (PC) to read text messages and Internet content. The two navigation joysticks and four navigation wheels allow the user to browse through information or program menus on a PC or mobile phone. Installed applications include Library and Tools. The esysLight is compatible with devices running many screen reader programs, including Jaws, Window Eyes, Supernova, Cobra v.9.x or higher, Mobile Speak, Mobile Speak Pocket, Talks, and VoiceOver. A 2 gigabytes (GB) micro SD card and a protective soft case for traveling are included. COMPATIBILITY: IBM or compatible computers running Windows or Linux and Apple Macintosh computers or iPod, iPhone and iPad. SYSTEM REQUIREMENTS: Microsoft Windows; Mac OS X; or iOS. POWER: Built-in lithium-ion rechargeable battery. Charging is through USB. DIMENSIONS (WxDxH): 32.5 x 8.6 x 2 centimeters. WEIGHT: 500 grams.