Thank you for this. I just found my old invoice and my existing ones are also Bosch. I'll replace it with the one you recommended.
EDIT: Has anyone used these?
TriTech (ISC-BDL2-WP12)
"TriTech units use both Passive Infrared (PIR) and Microwave Doppler Radar. Both must trigger to cause an alarm, which virtually eliminates false alarms from environmental factors like drafts, sunlight, or moving curtains."