The alarm was very easy to install, but initially would not activate. There was nothing in the instructions as to why, but after unplugging the connector and plugging it back in I had no problems. Multiple sensitivity, alarm tone, and sound adjustments. This does not have a battery back-up, but it would be difficult to get the seat off to disconnect the battery while the alarm is going off anyway (it is loud!). Nice that it is expandable to include the paging system/upgraded remote as well! Would recommend as a cheaper alternative to the $300+ systems out there.