With the original keyless entry kept alive, you can add an answer back function like the latest model. The sound of the buzzer is a sharp "pea" sound. Because the volume is large, you can also set the silent mode. Hazard blinking can be set to 2 times and 3 times for both LOCK and UNLOCK. However, since the flashing speed is a little faster, you may miss if you do not set it to flashing three times.