Mouse Jiggler MJ-2 (automatic mouse activity dongle -- fast heartbeat), packaged for retail sale...Constant mouse activity causes computers to not go idle, thus preventing sleep or screen savers from activating. No new software is installed or required. Mouse Jiggler registers as a Human Interface Device (HID). A single LED will count off the number of minutes Mouse Jiggler has been working. Constant large motions makes it obvious at a glance to the screen that Mouse Jiggler is working.