Add this little kit to any or all of your telephones. When one phone is used, a red LED will light on the other extension. This lets everyone know when your computer modem is in use. Power requirement 9v DC. Size: 1.1" x .6"
WARNING: This product can expose you to chemicals including DEHP which is known to the State of California to cause cancer and to cause birth defects or other reproductive harm. For more information go to: www.P65Warnings.ca.gov