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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Eufy Door Alarm Entry Sensor White - T89000D4

Eufy Door Alarm Entry Sensor White - T89000D4

Product ID: 255655789

Details

Brand
eufy Security
Colour
white
Compatible devices
Smartphone
Power source
Battery
Product dimensions
7.4L x 2.8W x

📱Smartphone app control

🔊100 dB siren alert

🔋800 days battery life

Description

🚪🔒 Secure your space, stay connected, and never miss a beat!

EFFORTLESS INSTALLATION - Peel, stick, or screw on in minutes—no tools or tech skills required.
INSTANT INTRUSION ALERTS - 100-decibel siren plus real-time smartphone notifications keep you one step ahead.
COMPACT VERSATILE DESIGN - Fits discreetly on any door or window frame, blending security with style.
SEAMLESS SMART INTEGRATION - Effortlessly syncs with your Eufy Security HomeBase and smartphone app.
UNMATCHED BATTERY LONGEVITY - Keep your home secure for over 2 years without a battery change.

The Eufy Door Alarm Entry Sensor T89000D4 offers a powerful 100-decibel siren and up to 800 days of battery life, ensuring long-lasting, reliable home security. Designed for easy installation on any door or window, it integrates seamlessly with the Eufy Security HomeBase and smartphone app to deliver instant alerts on forced entry. Compact, versatile, and backed by a 12-month warranty, this sensor is a must-have for proactive homeowners who value smart, hassle-free protection.

Specifications

ASIN	B07GJJZZ3G
Audible Noise	100 Decibels
Battery Description	Lithium
Battery description	Lithium
Best Sellers Rank	#8,383 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #8 in Home Security Door & Window Sensors
Brand	eufy Security
Built-In Media	Entry Sensor, CR123A Battery, Magnet, 3 x Mounting Screws, Owner's Manual, Happy Card.
Color	white
Colour	white
Compatible Devices	Smartphone
Compatible devices	Smartphone
Control Method	App
Customer Reviews	4.5 out of 5 stars 1,922 Reviews
EU Spare Part Availability Duration	2 Years
Global Trade Identification Number	00848061058666
Item Dimensions L x W x H	7.4L x 2.8W x 2.2H centimeters
Item Type Name	door sensor
Item Weight	0.15 Pounds
Manufacturer	Eufy
Manufacturer Warranty Description	12-month warranty and provide friendly, easy-to-reach support.
Mfr Part Number	AK-848061058666
Model Number	T8900
Mounting Type	Door Mount
Number of Batteries	1 Lithium Ion batteries required. (included)
Power Source	Battery Powered
Power source	Battery Powered
Product dimensions	7.4L x 2.8W x 2.2H centimeters
Sensor Technology	Contact Sensor
Size	motion sensor
UPC	848061058666
Unit Count	1 Count
Wattage	7.5 watts

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