Before the call, "This phone will automatically record conversations to prevent criminal damages such as bank fraud,”announcement is played to discourage fraud and your conversation is recorded automatically. In case of emergency, you can press the, “Emergency” button, which will alert up to four preregistered numbers sequentially, playing the prerecorded message.When the receiver is off the hook, the base unit issues a warning saying, “The receiver is off the hook.”- In order to use the blocked call (unblock call) function, you must input the specified phone number on the number display.External dimensions: 3.9 (W) x 5.9 (H) x 1.3 (D) inches (100 x 150 x 34 mm). The new 117 L-FSM-N117 has been enhanced with additional functionality. 1. The internal data recording time has increased from up to 30 hours/1000 items to up to 60 hours/2000 items. Micro SD cards (sold separately) for data retrieval are supported up to 32 GB. 2. Added one-touch registration function. Press the “Emergency” button to allow (or block) numbers from incoming calls that have been reported. A one-touch registration function has been added so all you have to do is hold the button down.　3. Allows you to refuse calls using specific phone numbers and refuse calls with only the first digit.Block incoming calls from overseas by registering the country code, etc.