remote open the door but wont close it keep coming back up, but i can close it from the inside ,do you think this will solve the problem ?liftmast

If you're able to close the door by holding down the button on the wall , then yes. However, it could be bad wiring ... maybe a bad connection. I see lots of time people use electrical tape and the adhesive actually breaks the connection over time. Try resplicing the connections if they are spliced first. If there is no splice, then it's possible the eyes are bad. To test them... use a newer 9volt battery. Detach both of the sensors and connect the matching wires together. Connect the wire with the black line to the positive side and the white to the negative. Line them so they are facing each other. If both lights come on then it's not the eyes. Could be a bad wire that is pinched or a bad circuit board on the motor unit. Good luck.

do these sensors come with wires attached to them ?

3 foot pigtails. You'll need to have wire from your opener to these and then splice them.

will they work for a craftsman opener ?

Yes, I used my with a Craftsman and it worked perfect.

Could I use this sensor to light up a light when the sensor is activated?

No. it has a circuit board in the door opening. It is not working like a switch but if the light is already on the garage door opener then that light will come on

Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

Help Track order

Account Cart

Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

Help Track order

Account Cart

Chamberlain 820CB Garage Door Safety Sensor Replacement, 2-Pack

Chamberlain 820CB Garage Door Safety Sensor Replacement, 2-Pack

Product ID: 372019211

Details

Brand
CHAMBERLAIN
Item dimensions L x W x H
3.13 x 4.5 x
Material
Plastic
Mounting Type
Bracket
Style
Sensors

📏Low-profile design minimizes misalignment

🔧Universal compatibility post-1997

⚠️Auto-reverse on obstruction for safety

€ 80.16

Duties & taxes included

In stock

Sold byAmazon AustriaDelivered 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 Austria.

Secure transaction

Description

🚪 Upgrade your garage safety game—because peace of mind never goes out of style!

TRUSTED RELIABILITY - Backed by a 1-year warranty and 4.6-star rating from over 800 users—join the safety-savvy community.
SAFETY FIRST ALWAYS - Instant automatic reversal on any obstruction—protect your family and belongings effortlessly.
SEAMLESS COMPATIBILITY - Fits all Chamberlain, LiftMaster & Craftsman openers made after 1997—upgrade without hassle.
SLEEK LOW PROFILE DESIGN - Discreet sensors reduce accidental knocks and keep your garage door system flawlessly aligned.
COMPLETE INSTALLATION KIT - Includes 2 sensors, mounting brackets, 18-inch extension wire, and clear instructions for a smooth setup.

The Chamberlain 820CB Garage Door Safety Sensor Replacement 2-Pack ensures your garage door automatically reverses upon obstruction, enhancing safety for all Chamberlain, LiftMaster, and most Craftsman openers made after 1997. Featuring a low-profile design to prevent misalignment, this kit includes sensors, mounting brackets, and extension wire for easy installation, backed by a 1-year warranty and trusted by thousands.

Specifications

ASIN	B09GB6JHRR
Best Sellers Rank	#30,427 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #12 in Garage Door Sensors
Brand	CHAMBERLAIN
Brand Name	CHAMBERLAIN
Customer Reviews	4.6 out of 5 stars 814 Reviews
Global Trade Identification Number	00012381197460
Included Components	2-sensors, mounting brackets, 18 in. of extension wire, instruction manual
Item Dimensions	3.13 x 4.5 x 6.5 inches
Item Highlight	Works with all garage openers made after 1997, Includes brackets and 18 in wire, Auto-reverses on obstruction
Item Type Name	Garage Door Safety Sensors
Item dimensions L x W x H	3.13 x 4.5 x 6.5 inches
Manufacturer	CHAMBERLAIN CORP
Material	Plastic
Material Type	Plastic
Model	820CB
Number of Items	1
Part Number	820CB
Style	Sensors
Style Name	Sensors
UPC	012381197460
Unit Count	1 Count
Warranty Description	1-year warranty

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

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.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Zainab N.

Fantastic and great service. Shipping was faster than expected.

1 week ago

Abdullah B.

Great price for an authentic product. Fast international shipping too!

3 weeks ago

View all Trustpilot reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App

Shop on the go, anytime, anywhere.

€ 80.16

Duties & taxes included

In stock

Sold byAmazon AustriaDelivered 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 Austria.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Anita G.

Good experience, but the tracking updates could be better.

2 months ago

Anjali K.

The product quality is outstanding. Exactly what I needed for my work.

1 month ago

View all Trustpilot reviews