|These are downloadable plans, requiring parts and assembly.|
Simple electronic circuit lets you pick up any extension phone without the users hearing a click. Great for checking on unauthorized phone use.
CAUTION: NOT FOR ILLEGAL USE!
A notification device, such as our BEEP10 Beeper Alert System, may be required by law for the legal use of this devie -- it is your responsibility to ensure compliance with state and other applicable laws, regulations, or restrictions on the use of this device.