Is the battery included?

Yes, It is included, You can purchase replacement type A23 batteries here: https://www.amazon.com/dp/B01C57SPQ6

Can I add another reciever?

Yes, you can purchase an extra receiver here: https://www.amazon.com/STARPOINT-Operated-Receiver-Expandable-Multi-Unit/dp/B00XHWU7SI https://www.amazon.com/STARPOINT-Operated-Receiver-Expandable-Multi-Unit/dp/B075KYWD6Y

can the recievers be plugged in outside and operate safely? I wanted to get one of these so that way I can tell if someone is at the front door when

I would not believe that you could plug them in outside. The people at the company are very nice. I would send them a note and ask, but there is nothing in the information I have that would lead me to believe it would be safe to use outside.

Does the receiver's outlet for us 110v electric need to be a 3 prong grounded outlet? old house, and those outlets are are in demand.

This receiver has 2 prong. I live in US also.Hope this help.

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Description

🔔 Elevate your entry game with smart, stylish chimes that never quit!

SMART LED ALERTS - Modern LED flash ensures guests are noticed day or night, blending style with function.
EFFORTLESS DIY SETUP - Includes everything for quick installation—no tools or tech skills required.
ENDURING POWER PERFORMANCE - Battery lasts up to 3 years, so you stay connected without constant replacements.
PERSONALIZED SOUND EXPERIENCE - Choose from over 50 chimes with 4 volume levels to match any mood or setting.
SEAMLESS LONG RANGE CONNECTIVITY - Patented tech delivers up to 1000 feet wireless range—perfect for sprawling homes and offices.

The SadoTech Wireless Doorbell kit features one transmitter and two plug-in receivers with patented technology enabling a 1000-foot wireless range. It offers over 50 customizable chimes, a 3-year battery life, and smart LED flash alerts. Designed for easy DIY installation and reliable performance in extreme temperatures, it’s ideal for large homes, offices, and versatile environments.

Specifications

Manufacturer	SadoTech
Part Number	ST-CXR
Item Weight	6.9 ounces
Product Dimensions	3.2 x 1.5 x 3.5 inches
Item model number	B00J4FHOB0
Batteries	1 A batteries required.
Is Discontinued By Manufacturer	No
Size	1 push button + 2 receiver
Color	White
Style	1 push button + 2 receiver
Finish	White
Material	ABS
Pattern	Patented Design
Shape	Round
Thickness	27.5 Millimeters
Voltage	110 Volts
Horsepower	0.01 hp
Installation Method	Self-adhesive tape or anchors/screw (included)
Item Package Quantity	1
Number Of Pieces	3
Capacity Description	SadoTech
Type of Bulb	LED
Head Style	SadoTech
Handle/Lever Placement	SadoTech
Handle Material	SadoTech
Accessory Connection Type	SadoTech
Compatible Fastener Range	SadoTech
Viewing Area	SadoTech
Coverage	900 feet
Display Style	SadoTech
Mounting Type	SadoTech
Plug Format	SadoTech
Switch Style	Push button
Special Features	SadoTech
Usage	SadoTech
Included Components	SadoTech
Batteries Included?	No
Batteries Required?	Yes
Battery Cell Type	Alkaline