If purchased to monitor catalytic converter tampering, how would it be positioned on the cc or on the vehicle?

This is actually a very popular use for the sensor. I think customers are generally placing it in the trunk or in a pocket of a door. Eric with YoSmart

Will the sensor detect breaking glass anywhere in the vicinity or does it just detect vibration from the window it is on?

Its detection technology is vibration-only, not acoustic or sound-activated. It is unlikely to respond to glass breaking in the vicinity. Please consider placing one of these sensors on each window or pane that you want to protect. And, if that is not practical, consider one of our motion sensors, for protection of a larger area. Eric with YoLink

Would a large sliding glass door need two of these?

Do both doors move? If not, probably, just one on the sliding door should be sufficient. Breaking the non-sliding one should shake the other one enough to activate the sensor. It does have adjustable sensitivity. You can tap or pound on the non-sliding one until you get the desired response. Eric with YoSmart

does it require subscription?

No required subscriptions, no fees. The app is free. There is a limited number of SMS alerts available. The number is determined by your quantity of devices times 5, plus five. A hub and two Vibration Sensors would give you 20 texts per month free. If you need more than that, you can add 200 or 500 more for two or five dollars per month by (optional) subscription. Of course you can get essentially unlimited emails and push notifications, including iOS Critical Alerts for iPhones.

Brand	YoLink
Model Number	YS7201-UC
Package Dimensions	6.7 x 5.2 x 2.4 cm; 60 g
Color	white
Name List for Name Plates	No hub
Material	glass metal
Power Source	Battery Powered
Voltage	230 Volts
Included Components	siren
Are Batteries Included	No
Battery Type	Alkaline
Paint Features	Smartphone compatible
Item Weight	60 g

YoLink LoRa Smart Vibration Sensor; Smart Shock, Glass Breakage, Tamper, Motion Detector, Generator Running, Email/SMS/Push Alerts, 1/4 Mile Open Air Range, Alexa, Hub Not Included

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