Every time your phone rings, this super bright strobe flashes to alert you—ideal for hard of hearing users. Strobe is lightweight and easy to install. It plugs directly into your phone and does not require additional power.
Dimensions: 3 inches wide, 2 inches high and 1 inch deep.
Simply installed by unplugging the phone, that would be used with the flasher, from the wall jack; Plug the phone flasher into the wall jack; and plug the telephone into the phone flasher.
Product Manual Click Here For The Krown Phone Strobe Flasher Instructions