The HPS55 ultrasonic detector is designed as an add-on module for the MAX 845 alarm system (24 Volt). Using ultrasonic sensing, it detects subtle movement inside the vehicle—such as people or objects—and boosts interior protection. Installation is straightforward: the module works in conjunction with the existing alarm system and can be integrated without major modifications. This expansion is ideal for improving intrusion detection, especially when the car is locked with all windows and doors closed. Vos Car Electronics offers this module with quality assurance and technical support. If you have questions about compatibility, installation or programming, feel free to reach out to our support team.