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.Duty & taxes paid at delivery

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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

$50.23

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Sold byAmazon British Virgin IslandsDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔔 Stay alert, stay connected — the smart sensor your home and business deserve!

SMART FALL PREVENTION - Accurate floor-level motion detection protects seniors without false alarms or sleep disruption.
UNMATCHED 918 FT RANGE - Stay connected across your home or business without missing a beat.
DUAL POWER FLEXIBILITY - Receiver runs on AAA batteries or USB-C for portable or plugged-in convenience.
EFFORTLESS WIRE FREE SETUP - Pre-paired sensor and receiver for instant, no-fuss installation anywhere.
CUSTOM ALERTS FOR EVERY SITUATION - Choose from 36 melodies and 4 volume levels including silent LED mode to suit day or night.

The HENDUN Motion Sensor Doorbell combines a powerful 918ft wireless range with customizable audio-visual alerts and precise infrared motion detection (13-26ft). Designed for both business entry monitoring and senior fall prevention, it offers easy wire-free installation, 36 ringtone options, 4 volume levels including silent mode, and dual power options (AAA batteries or USB-C). Ideal for caregivers and professionals seeking reliable, non-intrusive monitoring with instant alerts.

Specifications

ASIN	B077VV8ZJ1
Audible Noise	113 db
Battery Description	Alkaline
Best Sellers Rank	#55,858 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #49 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 (1,480)
Item Dimensions L x W x H	3.94"L x 1.97"W x 2.76"H
Item Highlight	Door Chime for Business, Entry Alert Store Welcome Buzzer Monitor , Fall Detection Alarm for Seniors , Caregiver Reminder
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
Number of Items	1
Power Source	Battery Powered
Sensor Technology	Motion Sensor
UPC	664248632944
Unit Count	1 Count

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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$50.23

Duties & taxes included

In stock

Sold byAmazon British Virgin IslandsDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to British Virgin Islands.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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3 weeks ago

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