4.2-inch WiFi Electricity Meter Information Push Card

The data sheet of product 

Product model: PW42_V2 

Dimensions (mm): 124 × 90 × 12 mm

Display technology: E-ink display

Display area (mm): 84.6 (H) × 63.4 (V)

Resolution (pixels): 400 × 300

Pixel size (mm): 120 dpi

Display colours: Black/White

Exterior Colour: White with grey outer ring

Viewing Angle: 180°

Operating Temperature: 0–50 °C

Battery Capacity: 3000 mAh (rechargeable polymer battery)

Power Supply: Type-C port charging

Battery Life: Approximately 1 year (2 uses per day)

Lights and Buttons: 3 × 7-colour LEDs & 3 buttons

Communication: 2.4 GHz Wi-Fi b/g/n

Supported content formats: Text / Images / QR codes / Barcodes

Wireless firmware updates: Yes

Remote control supported: Yes
Overview of the Device’s Structure and Interface
Screen: 4.2-inch monochrome e-ink display

LED Indicators: Seven-colour indicators for network connection, battery level and message status;

Registration button: Binds the device to the server and configures network access;

Call button: Backend message alerts and on-site call reporting;

Page navigation buttons: Switch between multiple pages of electricity bill details and notices;

Housing: Made from eco-friendly ABS material; lightweight, slim and easy to mount on a wall.

WiFi System Architecture

Key Product Advantages
1. Ultra-low power consumption and long battery life: The e-ink display retains the image even when powered off, whilst the 3,000 mAh lithium battery provides up to one year of use on a single charge for everyday use, reducing the need for frequent charging and maintenance;

2. Wireless, cable-free and rapid deployment: Utilising existing 2.4 GHz domestic or property management Wi-Fi networks, no separate cabling is required, enabling rapid roll-out in older residential estates and office buildings;

3. Automatic remote data synchronisation: Once integrated with the electricity meter system, electricity credit balances, account numbers and payment QR codes are automatically updated, eliminating the need for manual transcription and posting of paper notices;

4. Multifunctional interaction tailored to property management scenarios: The call button allows residents to report faults or make enquiries with a single press; LED indicators distinguish between various statuses, such as outstanding payments, new messages and offline status;

5. Open APIs for easy integration: Supports integration with third-party property management and electricity systems, linking to the electricity meter database to enable automated data flow;

6. Low visual strain and long-lasting display: 180° wide viewing angle, non-reflective e-ink screen, clearly legible in strong light in corridors and indoors, and easy on the eyes.

Core Features of the Signage Back-end Management Software
1. Visual Template Customisation: Freely arrange screen layouts and adjust the positions of text, QR codes and images as required, suitable for scenarios such as electricity bill display and notice postings;

2. Remote Content Distribution via Multiple Protocols: Supports two mainstream IoT protocols: HTTP and MQTT; enables the upload of local images, online images and custom templates for one-click push to devices;

3. Real-time monitoring of full device status: Real-time feedback on device online status, Type-C charging status and button operations (short press/long press recognition); automatic background alerts for faulty devices;

4. Remote OTA updates: Batch wireless updates of device firmware without the need for disassembly, resulting in low maintenance costs;

5. Display quality optimisation: Built-in dithering algorithm for images ensures clearer, seamless display on black-and-white e-ink screens;

6. Compatibility with multiple screen models: Supports e-ink terminals of various sizes and resolutions; can be extended to include utility meters and property management notification cards of multiple specifications.

Typical Application Scenarios
1. Electricity bill display for residential properties: Wall-mounted at each household’s entrance, displaying in real time the household number, current month’s electricity balance and an online payment QR code, replacing paper electricity bills;

2. Property management notice terminals: Swipe to view notices regarding water and power cuts, community announcements and property management updates; notifications can be sent in bulk via the backend;

3. Integrated electricity and water bill notifications for flats and rental properties: Simultaneously displays electricity and water consumption data; tenants can scan a QR code to pay online;

4. Electricity management for commercial premises in business parks: Centralised management of electricity meter data across multiple premises; bulk viewing via the backend and remote sending of overdue payment reminders.

The 4.2-inch WiFi e-ink electricity meter notification card utilises a 2.4 GHz wireless local area network and a cloud-based management platform to enable remote, automatic updates of electricity consumption data, interactive communication with residents, and the centralised distribution of property management notices.

The hardware is low-power and easy to install, whilst the backend supports customisable templates and integration with third-party systems, providing a perfect replacement for traditional paper electricity bills. It is suitable for scenarios requiring the digital upgrade of electricity billing in residential estates, apartment blocks and commercial parks.