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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Description

🚪🔒 Stay a step ahead—secure your space with silent power and loud protection!

POWERFUL 100 D B SIREN - Instantly deter intruders with a loud, attention-grabbing alarm.
EFFORTLESS INSTALLATION - Peel, stick, or screw on in minutes—no hassle, no tools required.
SEAMLESS SMART INTEGRATION - Control and monitor via the intuitive Eufy Security app anytime, anywhere.
DISCREET VERSATILE DESIGN - Sleek white sensor fits perfectly on any door or window frame for subtle protection.
UNMATCHED BATTERY ENDURANCE - Keep your home secure for over 2 years without a recharge.

The Eufy Door Alarm Entry Sensor T89000D4 offers a compact, easy-to-install security solution with a robust 2-year lithium battery, a piercing 100-decibel siren, and seamless app control via the Eufy Security HomeBase. Designed for doors and windows, it ensures reliable forced-entry alerts, combining smart technology with minimalist design for professional-grade home protection.

Specifications

Battery description	Lithium
Number of batteries	1 Lithium Ion batteries required. (included)
Voltage	3 Volts
Control method	App
Noise level	100 Decibels
Mounting type	Door Mount, Window Mount
Sensor technology	Contact Sensor
EU Spare Part Availability Duration	2 Years
UPC	848061058666
Global Trade Identification Number	00848061058666
Manufacturer	Eufy
Part number	AK-848061058666
Item Weight	68 g
Product Dimensions	7.4 x 2.8 x 2.2 cm; 68 g
Batteries	1 Lithium Ion batteries required. (included)
Item model number	T8900
Size	motion sensor
Color	white
Style	Sensor
Wattage	7.5 watts
Item Package Quantity	1
Included components	Entry Sensor, CR123A Battery, Magnet, 3 x Mounting Screws, Owner's Manual, Happy Card.
Batteries Included?	Yes
Batteries Required?	Yes
Battery Cell Type	Lithium Ion
tech_spec_battery_description_toys	Lithium

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