Dont miss another important call! Whenever you receive a landline or videophone call this transmitter sends a signal to any Medallion Series receiver, which will alert you with flashing lights or vibration. With the Medallion Series you get million-code technology, which means your system will never get a false alert from a neighboring radio frequency signaling system. Its ideal for apartments, dorms, condos and hotels, as well as single-family homes. Features: Alerts to landline, videophone, VCO or TTY calls Connects to phone jack of any standard analog phone Up to 500ft range Uses 2 AA batteries (included) Low battery indicator light