This is for one genuine Laserline. So there are probably many of those alarms out there that are still functional but may need a new siren.
Volvo FOMOCO Car Siren Alarm 2.4V Battery for Siren model 6G9N-19G229-AK/BK
Volvo C70, V70 & S70 Car Siren Alarm 4.8V Battery for 96~05 Siren model 8614974
Mercedes-Benz Genuine Alarm Siren Left For A-Class B CLK SL W169 W245 CL203 S202
Laserline Ultrasonic Sensors to fit Laserline Car Alarm
Clifford AvantGuard 5 Car Siren Alarm 7.2V Battery for model AG5 Concept 600/650