4.2″ Bluetooth ESL E-ink Display Tag
KESL042C(R) series Bluetooth ESL 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, production line, etc.
KKM Bluetooth ESL platform is a complete hardware-software system combining Bluetooth5.0 wireless communication and ESL tags, in-store navigation, ultra-low power displays, merchandising supports and tools and server infrastructure (cloud, chain-store or in-store). KKM provide SDK/API, which is 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.
No light pollution
Black, White, Red, Yellow color available
Bluetooth 4.0/5.0 wireless communication
400×300 pixels full graphic,
Cloud or local Server based options
4.2 inch Bluetooth ESL Electronic Shelf Label
|Screen Size||4.2 inch (diagonal)|
External (W x H x D) Visible screen area (W x H)
|4.05 x 3.62 x 0.31”|
83.0 x 62.0mm (3.27” x 2.44”)
|Display Pixels||400 x 300 (120,000)|
|Dots per inch (DPI)||95|
|Display Type||Black and white Colors|
Bi-stable EPD(E-ink Display)
|Black, white and Red Colors|
Bi-stable EPD(E-ink Display)
|Orientation||Landscape or Portrait|
|Viewing angle||Near 180°|
|Appearance||Standard unit available with white frame|
|Unit identifier barcode||Recognized 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|
|Fittings||Supported by multiple fitting options – stands, adapters, individual long-length shelf-rails. Additional specialist fittings also available upon request.|
|Battery||Li-Ion Battery 850mAh, 3.0V|
|Work time||2~3years(3 times refresh per day)|
|Yes (MOQ applies)|
3.2 Access Point (AP)
|Communication||2.4G BLE5.0/BLE4.0 wireless|
|Number of KGateway1C Cover||Each covers 1000 ESLs|
|Covered distance||100 meters, Suggested 30m (Radius)|
|Size||173.0 x 90.0 x 56.9mm|
|Working Temperature||-10°C ~ + 60°C|
|Power supply||DC +5.0V or POE|
|Port to Server||4G, WIFI or Ethernet cable|
4. Why KESL Label
|Bluetooth beacon function|
• It can set and record the location of different commodities to facilitate the management.
Error is less than 1m.
• Can expand new functions by developing APP. For example, APP will choose the best way
and guide customers to the commodities that they are searching for.
| ESL Cloud|
• ESL Cloud system is a cloud server based complete solution with hardware and auto-
• All ESL tags can be controlled anytime and anywhere with cloud server.
• All data can be shared on the cloud.
• High Contrast: Use E-paper display with black and red on ‘paper-white’ background.
• Near 180° viewing angle with excellent
readability, compare to CH LCD ESL:
• We can provide API interface to the third-party, whom can strengthen managementability by embedding our ESL into their own system, and providing more powerful, flexible and competitive solution to end customers.
• Combine ERP with ESL perfectly to make products more competitive.
|Viewing angle||Near 180°||120°|
|Custom-made Template design|
• It’s easy to edit and create display templates.
• You can use any font in your system. It also
enable any combination of text and images including QR code, Bar code, logos, pictures, etc.
• Negative explicit mode and special symbols
• ESLs available in a range of different sizes and specifications to suit all requirements across an
entire retail estate.
• Monitoring. It will give a warning when it is out of power or be stolen.
• It can be customized with many functions to
enhance customers’ experience.
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.