Notification if a door is left open? Is there a way to set a delay lets say 5 mins so if the door left open for 5 min or more, it notifies via alert?

Yes, after 5 mins and many other options. Please see the video.

How many eufy security ***entry sensors** can be used per base station? how many cameras can i use simultaneously with said sensors?

One HomeBase can support up to 16 cameras and 16 entry sensor.

Does the updated homebase 2 firmware expose these sensors to apple's homekit?

We are sorry that these sensors cannot support homekit.

If power is lost and you have the plus monitoring service will you get notified of the power outage?

I am going to say no. It has to check in with them over the Internet and there could be numerous reasons that communications don't reach them. I would be surprised if it does actually check in regularly instead of just waiting to send an alarm alert. On my old alarm it has a battery backup and uses the landline phone to call in issues. So, if the power goes out it will use the battery backup to make a landline call and then the monitoring station will call me. Usually when the battery is low. I could be wrong but it's unlikely this configuration could support that notification. If you have a UPS that keeps your internet powered up then it, or the PC, can be configured to send an alert then it goes to battery.

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🚪🔒 Secure your space, stay one step ahead.

POWERFUL 100 D B SIREN - Deters intruders instantly with a siren as loud as a jackhammer, ensuring your home’s security is never compromised.
SLEEK COMPACT DESIGN - Minimalist ASA composite build fits discreetly on any door or window frame without disrupting your modern aesthetic.
SEAMLESS SMART CONTROL - Effortlessly monitor and control your entry points via a sleek app, keeping you connected wherever you are.
HASSLE FREE INSTALLATION - Peel, stick, and secure with included mounting screws—no tools or professional help needed to fortify your home.
UNMATCHED BATTERY LONGEVITY - Stay worry-free with 730 days of continuous monitoring on a single CR123A battery.

The EUFY T8900 Entry Sensor combines cutting-edge ASA composite material with a powerful 100-decibel siren and a 2-year battery life, delivering reliable, app-controlled security for doors and windows. Compact and easy to install, it offers instant smartphone alerts to keep your home protected from break-ins with minimal effort.

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Voltage	3 Volts
Control Method	App
Noise Level	100 dB
Mounting Type	Door Mount
Sensor Technology	Contact Sensor
UPC	848061058666
Global Trade Identification Number	00848061058666
Manufacturer	Anker Innovations Ltd
Item model number	T8900
Product Dimensions	7.4 x 2.8 x 2.2 cm; 68 g
ASIN	B07GJJZZ3G

EUFY T8900 Entry Sensor (White)

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