2.9″ Bluetooth ESL E-ink Display Tag

KESL029C(R) series Bluetooth ESL Eink Display Tags with high definition displays can be adapted to any sales scenarios. It supports text, promotion, QR code or barcode and can be reused with no paper required. It can be used for different application, such as the retails, warehouses and logistics management, smart production line, etc.

KKM provides the Bluetooth ESL development kit, which is a complete hardware-software system combining Bluetooth5.0 wireless communication and Bluetooth ESL tags, in-store navigation, ultra-low power displays, merchandising supports and tools and server infrastructure (cloud, chain-store or in-store). KKM’s Bluetooth ESL development kit is able to open to the third-party technologies and enables interconnection with any situation software or system. It offers the flexibility you need to anticipate and overcome any challenge.


Bluetooth 5.0

BLE 5.0 technology, automate your business, proximity marketing, indoor navigation, production line management 

Low Power Consumption

BLE low power, ultra long battery life, reduce your maintenance cost 

Open API 

Open API to integrate to 3rd party software/backend/backend 

Convenient & Automative

Manage multi ESLs in different locations by just once click, reduce your labor cost and maintenance cost  

Compatible with Gateway & App 

Patented algorithm, you can update the ESL display via Gateway, smartphone or other BLE enabled device, such as Raspberry pi  

Superior Readability  

Near 180° viewing angle, custom display template and content, partial area refresh/update, different picture node play mode  


Smart Warehouse Solution

Bluetooth e-ink label can be used to display the item in warehouse, easily to update the item name, quantity from user platform.

Greatly reduce the labor cost, increase the working efficence.

Supermarket Automative

Bluetooth e-paper tag can be used in supermarket, chain stores, you can use one ESL gateway/AP to manage up to 1000 ESLs. It can reduce your lobar cost and maintenance cost by updating all prices in different locations in front of PC.


 2.9 inch Bluetooth ESL Electronic Shelf Label

Screen Size2.9 inch (diagonal)

External (W x H x D) Visible screen area (W x H)

66.9 x 29.0mm
Display Pixels 296 x 128 (37,888)
Dots per inch (DPI)112
Display TypeBlack and white Colors

Bi-stable EPD(E-ink Display)

Black, white and Red Colors

Bi-stable EPD(E-ink Display)

OrientationLandscape or Portrait
Viewing angleNear 180°
AppearanceStandard unit available with white frame
Unit identifier barcodeRecognized by Scanner or Labeling on back
Operating temperature Range 0°C to 50°C, +32°F to 122°F
Storage temperature range-20°C to 70°C, -4°F to 158°F
FittingsSupported by multiple fitting options – stands, adapters, individual long-length shelf-rails. Additional specialist fittings also available upon request.
Communications2.4G wireless
Battery2*CR2450 Battery
Work time3 ~ 5years(3 times refresh per day)

Frameoclors available


Yes (MOQ applies)

3.2 Access Point (AP)

KKM KG01 Bluetooth LTE WiFi beacon gateway scanner


Communication2.4G BLE5.0/BLE4.0 wireless
Number of KGateway1C CoverEach covers 500 ESLs
Covered distance30m (Radius)
Size173.0 x 90.0 x 56.9mm
Working Temperature-10°C ~ + 60°C
Power supplyDC +5.0V or POE
Port to ServerWIFI or Ethernet cable
Installation wayScrew

3.3 Shelf Rail and Dismounting tool

AppearanceStandard unit available with white shelf rails
SizeWidth x 40mm

The length of Rail is flexible, up to the customer

Fixing hole pitch22mm


Theft proof function availableYes
Dismounting tool availableYes
Shelf Rails colours availableYes (MOQ applies)

4. Software/hardware Architecture

5. FAQ:


How many ESLs can be managed?

It is no limit. But it will affect the updating speed if there are too many labels to be managed, We suggest each KESLGateway/base station manage 1000 ESLs.


Can I make custom content display on the ESLs?

Yes, we will provide the development kit. The development kit includes the instruction&tools to create the content, source code of these tools, and API.


How to establish relationship between ESL and AP?

You don’t have to establish the relationship between ESL and AP. You just need to follow the instruction and implement the AP to your platform/software. 


Is there a solution that can indicate the discount for customers with a certain distance?

Yes, there is. For example, we can provide both ESL with LED light and with RED Color.


Can I use phone App instead of AP?

Yes, you can use phone App or other Bluetooth device (such as Raspberry pi) which support BLE4.0/5.0. 


What’s the next after I bought the ESL system?

We provide API, demo and tools to create display template and implement to your own software/plaftorm.