With just the push of a button you can leave a message for your family, roommate, follow workers, etc. faster than you can write a note. The GE Message Reminder is easy to install and use. It is battery operated (no wiring involved) and can record a message up to 20 seconds long. A green LED light will blink when there is a new message that has not been played yet. The message stays stored until you record a new one. It comes with a heavy duty magnetic back that is perfect for mounting to the refrigerator or it can also be mounted to a non-metallic surface using one pan head screw (not included). A built in digital clock display is useful for referencing date and time you record the message. It requires 4 AAA batteries that are not included. It measures four and one-quarter inches x three and one-half inches x one-half inch.