ViSee Electronic Digital Magnifier for TV and Computer: Visual/Reading Aide Eight adjustable magnification levels from 2x to 32x (on a 21" screen). Zoom in/out digitally. Four display modes: full color, black type on white, white type on black, high contrast. Bright long lasting LED lights illuminate the reading material for a clearer image. Screen Lock: freeze a text image on screen for easier reading. Oversized, ergonomic mouse for comfortable use, even for those with arthritis. 4 roller wheels for easy and smooth moving on reading material. Simple to use with single clicks for all features and functions. Green 'ON' button lets you know the mouse is switched on. Image system: PAL/NTSC. Video connector: RCA. Compatible with any TV/monitor with RCA input. 80-in. (nearly 7-ft. long) video output cable. Work on computer with the use of USB converter and software (included in the package. For Windows 10, download "Oasis.exe" from our website). Compatible with Windows 10/8/7/Vista/XP when use on Computer. You need to download our generic USB camera software "Oasis.exe" from our website. USB converter interface: USB 2.0.