BIWITECH SMARTTAG E-INK 4.2R
Enhance Your Retail Display with Tricolor Smart Digital Labels
Enhance your retail experience with the SmartTag Biwitech E-Ink 4.2R. This advanced electronic shelf label features a larger tricolor display with red highlights, perfect for showcasing promotions and detailed product information. With real-time updates and energy-efficient technology, it's the ideal solution for modern retail environments requiring impactful visual communication.


Key Features
Tricolor Display
Black, white, and red colors for impactful visual communication.
Energy Efficient
Long battery life with ultra-low power consumption.
Real-Time Updates
Instantly update prices and promotions across your store.
Durable Design
Built to withstand retail environments with a sturdy construction.
Wide Viewing Angle
Clear visibility from various angles for customer convenience.
Smart & Efficient Digital Labels
With e-paper technology, ultra-low energy consumption, and long-lasting 3-5 year battery life, SmartTag Biwitech E-Ink 4.2R provides a future-ready solution for comprehensive digital pricing and product information needs.
E-paper Technology
Crystal clear display with red highlights for enhanced visibility
Ultra-low Energy
Efficient power consumption for extended use
Long Battery Life
3-5 years of operation on a single charge
Product Dimensions
Precise Measurements
87.5mm
Width
44.5mm
Height
13.8mm
Depth
Display Features
- • 4.2-inch E-ink display
- • Tricolor capability (Black/White/Red)
- • 400 x 300 pixel resolution
- • Integrated QR and barcode support

Benefits
Enhanced Visual Impact
Tricolor display for eye-catching promotions and clear pricing information.
Improved Customer Experience
Larger 4.2-inch display ensures better visibility and readability of product information.
Operational Efficiency
Automate pricing updates and reduce manual workload with real-time wireless updates.
Cost Savings & Sustainability
Reduce the need for printed labels, lowering waste and environmental footprint.
Ideal Applications
Retail Stores
Dynamic pricing and promotions with red highlights for special offers
Supermarkets
Efficient management of large-scale pricing systems with promotional emphasis
Warehouses
Clear inventory management and product identification
Electronics Stores
Detailed product information with highlighted features
Simplified, Powerful, and Efficient
Multi-function Integration
Combining data processing, routing, and transmission into one efficient device.
Direct ERP Connectivity
Seamlessly integrates with your ERP system for real-time data synchronization.
Browser-Based Interface
Simplifies management and reduces IT overhead.
Effortless Scalability
Supports multiple ESLs without performance degradation.
Streamline your operations with the simplicity and power of the Integrate SmartTag Controller

Technical Specifications
Feature | Specification |
---|---|
Part Number | SMARTTAG_E42R_V4 |
Dimensions (mm) | 3.44inx4.11inx0.50in (87.5x104.5x12.7mm) |
Screen Size | 4.2 inch |
Display Technology | E ink |
Active display area | 3.34in (H) x 2.50in (V) (84.8x63.6mm) |
Resolution (pixels) | 400 x 300 pixels |
Pixel size | 0.212 in x 0.212 in (5.38 x 5.38 mm) |
Pixel Colors | Black/White/Red |
Viewing angle | Nearly 180° |
Operating temperature | 0°C-50°C (32°F - 122°F) |
Product weight | 104.4g (0.23 lb) |
Battery | 2400mAh (CR2450*4) |
Battery life | 3-5 years |
ESL operating frequency | 2.4GHz |
Communication radio | 30 m |
DIY Stencil Design | Available |
Supported content formats | Text/Image/QR Code/Barcode |
SmartTag Family Applications

From retail pricing to meeting room management, SmartTag E-INK displays offer versatile solutions for any business need