The Olympus DS-2500 is a digital recorder that can be used by individuals who are blind or have low vision. This portable recorder features the Digital Speech Standard Pro (DS2) format, over 148 hours of recording time with QP (Quality Playback) mode, and over 303 hours of recording time with SP (Standard Playback) mode using a 2 gigabytes (GB) SD memory card (included), and it is compatible with voice recognition software. The sampling frequencies are 16 kiloHertz (kHz) for QP mode and 12 kHz for SP. The overall frequency responses are between 200 Hertz (Hz) and 7 kHz for QP mode and between 200 Hz and 5 kHz for SP. Other features include a 1.7-inch orange light emitting diode (LED) backlit liquid crystal display (LCD) screen, a customizable navigation pod, an “Erase” button, USB interface, 5 folders (200 messages per folder), write protection, a built-in 23-millimeter (mm) round dynamic speaker, a 3.5-mm microphone jack, and a 3.5-mm headphone jack. The DS-2500 comes with DSS Player Software which allows the user to manage files on their computer. The user can end one dictation and begin the next by pressing the "New" button, and switch between "Conference" and "Dictation" settings. The "Variable Control Voice Actuator" feature records only when the microphone senses sound. "Index Marks" allows the user to electronically mark when each file begins. Available languages include English, German, French, Spanish, Italian and Russian. OPTIONS: Headphones, microphones, BR-401 Ni-MH Battery Pack (AAA-4 Pack), Scandisk Extreme SDHC Class 10 (4GB), foot switch software, Foot Switch (RS-27), PC Transcription Kit (AS-2400), wrist straps, and neck straps. COMPATIBILITY: For use with IBM and compatible computers or Apple Macintosh computers with a USB port. SYSTEM REQUIREMENTS: Microsoft Windows XP, Vista, or Windows 7 with a 1 gigaHertz (GHz) or greater processor, 256 MB RAM (Windows XP) or 1 GB (Windows Vista or Windows 7 32-bit) or 2 GB (Windows 7 64-bit), video card with 800 x 600 display, CD/DVD drive, and one free USB port; or Mac OS X 10.4.11 to 10.7 with a PowerPCR G3 500 megaHertz (MHz) processor or greater or Intel Core Solo/Duo 1.5 GHz processor or greater, 256 MB RAM, video card with 1024 x 768 display, CD/DVD drive, and one free USB port. POWER: Uses two AAA alkaline batteries (LR03 or R03, ZR03) (included) or two AAA Ni-MH rechargeable batteries (not included). Battery life for recording is 30 hours (QP mode) and 37 hours (SP mode), and for playback is 35 hours (all modes). DIMENSIONS (HxWxD): 4.47 x 1.97 x 0.67 inches. WEIGHT: 3.7 ounces including alkaline batteries.