how do you sinc two receivers to one sensor?

long press the volume key for 3 seconds,enter into learning mode, release the volume key, program starts. The user manual will be introduced in detail.

Can i use power bank as power source?

Yes, you can. Receiver of the bell using 3 5(AA) alkaline batteries or Micro USB supply power( not included), Infrared curtains using 3 7(AAA) alkaline batteries or Micro USB supply power( not included).

how do i buy the remote controller ?

You can buy this https://www.amazon.com/dp/B01HUS7RP0/ref=sr_1_1?ie=UTF8&qid=1529542599&sr=8-1&keywords=B01HUS7RP0

Does the wind cause this to ring?

Thank you for your attention to HENDUN motion sensor doorbell. The wind will not cause the ringing. Thanks again.

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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HENDUN Motion Sensor Doorbell for Business, Bed Alarm for Elderly Dementia

HENDUN Motion Sensor Doorbell for Business, Bed Alarm for Elderly Dementia

Product ID: 72915073

Details

Brand
HENDUN
Color
1 Receiver & 1
Compatible Devices
Motion
Power Source
Battery
Product Dimensions
3.94"L x x

📶918ft wireless range

🔔36 ringtones + 4 volume levels

🛡️13-26ft infrared motion detection

R978

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚪 Stay Alert, Stay Ahead: The Motion Sensor Doorbell That Works as Hard as You Do!

SMART FALL PREVENTION - Accurate floor-level motion detection gives precious seconds to prevent senior falls without false alarms.
EFFORTLESS WIRE FREE SETUP - Pre-paired sensor and receiver for instant, hassle-free installation anywhere.
UNMATCHED LONG RANGE FREEDOM - Stay connected up to 918ft away—perfect for multitasking caregivers and busy professionals.
CUSTOMIZABLE ALERTS FOR EVERY SITUATION - Choose from 36 melodies and 4 volume levels including silent LED mode to suit day or night care.
DUAL POWER OPTIONS FOR ULTIMATE FLEXIBILITY - Use AAA batteries for portability or USB-C for continuous power—your choice, your convenience.

The HENDUN Motion Sensor Doorbell combines advanced infrared detection with a powerful 918ft wireless range and customizable audio-visual alerts. Designed for both business entrances and sensitive elderly care, it offers easy wire-free installation, multiple ringtones, and flexible power options—ensuring you never miss a moment, whether monitoring a storefront or protecting loved ones with dementia.

Specifications

ASIN	B077VV8ZJ1
Audible Noise	113 db
Battery Description	Alkaline
Best Sellers Rank	#46,165 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #46 in Door Bells Chimes
Brand	HENDUN
Color	1 Receiver & 1 Transmitters
Compatible Devices	Motion Detector
Control Method	Remote
Customer Reviews	4.4 4.4 out of 5 stars (1,478)
Item Dimensions L x W x H	3.94"L x 1.97"W x 2.76"H
Item Weight	7.04 ounces
Manufacturer	Changzhou Hengdun Electronic Technology Co Ltd
Maximum Range	25.92 feet
Mfr Part Number	43239-217649
Model Number	43239-217649
Mounting Type	Wall Mount
Power Source	Battery Powered
Sensor Technology	Motion Sensor
UPC	664248632944
Unit Count	1 Count

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