The Multi Phone Ringer and Flasher works with your cell phone and landline at the same time, so you"ll always know when you have an incoming call or text message. When you receive a call or a message on either phone, the Multi Phone Ringer and Flasher alerts you with an extra loud tone, plus a bright flashing light. A built-in USB port lets you charge your device while it rests on the cradle. Works with all iPhones, Samsung Galaxies and other Android smartphones.