How are they programmed?

You need some sort of programmer. I used this one which works well : https://www.amazon.com/dp/B08QMMGZLB?ref=ppx_yo2ov_dt_b_product_details&th=1

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3PCS ESP8266 ESP-01S Wireless WiFi Transceiver Relay Module Compatible for Arduino Smart Home Remote Control Unlock Set

Product ID: 445587188

Details

Brand
AOICRIE
Connector Type
Screw
Contact Type
Normally Open
Mounting Type
Surface Mount
Operation Mode
Automatic

⚡5V relay control

📶300m WiFi range

🧠80MHz CPU, 1MB memory

€ 30.88

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Sold byAmazon AustriaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚀 Unlock your smart home’s full potential with wireless power at your fingertips!

TRIPLE PACK VALUE - Three ESP-01S modules with relay boards to scale your smart projects instantly.
PLUG PLAY DIY FRIENDLY - Includes APP and LUA source code for quick customization and deployment.
COMPACT LIGHTWEIGHT DESIGN - Fits effortlessly into tight spaces for sleek, invisible automation.
ROBUST INDEPENDENT PROCESSING - 80MHz CPU with 1MB memory handles complex tasks without lag.
SEAMLESS SMART HOME INTEGRATION - Control any device remotely via stable 802.11 b/g/n WiFi connection.

The 3PCS ESP8266 ESP-01S Wireless WiFi Transceiver Relay Module set offers a compact, powerful solution for smart home automation. Featuring a stable 802.11 b/g/n WiFi connection with up to 300m range, 5V relay control, and an 80MHz CPU with 1MB memory, it enables remote control of devices via phone or custom apps. Perfect for DIY enthusiasts, it comes with source code and three modules for scalable projects.

Specifications

ASIN	B09XHJFBSH
Best Sellers Rank	#241 in Computer Networking Transceivers
Brand Name	AOICRIE
Coil Voltage	5 volts
Connector Type	Screw
Contact Type	Normally Open
Customer Reviews	3.9 3.9 out of 5 stars (40)
Included Components	Blu-ray
Manufacturer	AOICRIE
Maximum Switching Voltage	5 volts
Minimum Switching Voltage	5 volts
Mounting Type	Surface Mount
Number of Items	3
Number of Terminals	3
Operation Mode	Automatic
UPC	701715508514
Unit Count	3 Count
Warranty Description	3 months

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€ 30.88

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

Imran F.

Very reliable shop with genuine products. Will definitely buy again!

2 weeks ago

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

View all Trustpilot reviews