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4.2inch bluetooth esl supermarket digital shelf labels digital price tags

Categories	Bluetooth Electronic Shelf Labels
Brand	Sertag Electronic shelf labels Manufacturer
Model	SETB0420N
Color Display	white and black
Display Size	4.2 inch
Outline	103.0x92.0x8.0mm
Display Resolution	400* 300
Communication Band	2.4G 16-way wireless
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Update Time	Jul 19,2025

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Detail Information

4.2inch Bluetooth ESL Supermarket Digital Shelf Labels Digital Price Tags

Feature

1. Low energy(BLE)

2. Red /Yellow color available

3. Cloud or local Server based options

4. Bluetooth 5.0 wireless communication

5. 400x300 pixels full graphic, E-Paper displays

6. Perfect for the retails, warehouses, logistics management and meeting system

Model	SETB0420N
Screen Size	4.2"
Dimension	103.092.08.0mm
View Area	83.0*62.0mm
Display Resolution	400*300
Display Type	Bi-stable EPD(E-ink Display)
Display Color	Black and White Colors
Appearance	Standard unit available with white frame
Unit Identifier Barcode	Recognized by Scanner or Labeling on back
Operating Temperature	0℃~50℃(+32℉~122℉)
Storage Temperature	-20℃~70℃(-4℉~158℉)
Battery Life	2~3yeas for one battery
Replaceable Batteries	Li-Ion Battery 850mAh, 3.0V replaceable
Weight	50g
Communications	2.4G Bluetooth 5.0 wireless
Frame Colors Available	Yes(MOQ applies)

Software/hardware Architecture 1

• This ESL device are managed by our Gateway.

• The Gateway using MQTT/JSON open API for third part to easy integrate it.

Software/hardware Architecture 2

This ESL provide open API and can be managed by IOS/android app.

Advantages

1. Opening Platform Design

ESL Gateway not only an ESL manager. It’s an open platform to make your ESL and other other sensor easily connect to cloud.

All the interface are opening for third part.

• Support third part ESL/BLE device connect to the cloud via BLE GW;

• Support third part MQTT server;

2. Self-organized deployed

•Once you deployed the ESL(>1000pcs) and Gateway, the relationship between ESL and Gateway will automatic setup within 3~5 minute.

•Gateway supports redundant configuration, once one Gateway down, other Gateway(with in same coverage) will automatic take over ESL management within 10 seconds.

•Gateway support pool load balance deployed, the Customer Inventory System can select an light load Gateway to update price about ESL.

3. Open API Example: ESL monitor

4. Two-way authentication ensures device security

To ensure that the devices and gateways are not illegally connected. BLE Gateway and device using Bi-directional MD5 with random authentication.

5. Web portal Configuration

6. Open source code/SDK on Google

1).Gateway integration guidance and gateway installation and configuration guidance.

2). The client software Demo supports the connection of the MQTT server address and is based on the Java1.7 version.

3). Convert the BIN formatted image to the demo of the MQTT JSON message, based on the C language implementation, developed using Visual Studio 2010.

We will continue to update the resources to make your develop more easily.

APP SOLUTION :Connection the ESL using APP

• The ESL support bluetooth4.1 and bluetooth 5.0, You can use ipad and iphone to connect to ESL for updates.

• We can provide the bluetooth API for manage the ESL.

• We also provide IOS Android demo app for your quick development. Please noticed that the phone/iPad must support bluetoooth4.1 or bluetooth5.0.

Application

4.2inch bluetooth esl supermarket digital shelf labels digital price tags

4.2inch bluetooth esl supermarket digital shelf labels digital price tags

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