Will it trigger if the intruder breaks the window?

Not unless the sensor happens to fall off during the break in. It's not intended to detect breaking sound.

how do you get the cover off?

Either with finger nail or a small flat screwdriver. It comes off very easy. I love this switch. Already there are three in my townhouse. After changing the battery, it starts working with no set up needed.

Can you set timer on these devices to not activate? Ex: if use on window, there are times in the days i would like to leave the window opens wo alarm

So far I have not had an actual alarm go off at any point. It does however keep track of when the door is opened and closed I am sure that if you leave it open and an alarm goes off it will be able to be desmised by your phone.

Number of Batteries	2 AAA batteries required. (included)
Voltage	3 Volts (DC)
Control Method	App
Noise Level	65 dB
Mounting Type	Wall Mount
Sensor Technology	Contact Sensor
UPC	770619959104
Manufacturer	SENCKIT
Part Number	door window sensor
Item Weight	1.76 ounces
Product Dimensions	2.83 x 0.98 x 0.55 inches
Country of Origin	China
Item model number	door window sensor
Batteries	2 AAA batteries required. (included)
Included Components	Detector
Batteries Included?	Yes
Batteries Required?	Yes
Battery Cell Type	Alkaline

WiFi Door and Window Sensors,Tuya Smart Alarm with Free Notification APP Control Home Security Alarm System, No Hub Required,Compatible with Alexa, Google Home (1-Pack)

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