An e ink price tag is a small, battery-powered shelf display that shows a product price on an electronic-paper screen and updates wirelessly from central software, replacing the printed paper price tag. The e ink price tag keeps its clear, paper-like look under any store lighting and runs for years on a single coin-cell battery. The guide below explains how an e ink price tag works, how long the battery lasts, what sizes and colors exist, and what the tags cost in 2026.
What Is an E Ink Price Tag?
An e ink price tag is a digital price label that uses electronic-paper (e-ink) technology instead of ink on paper. The screen looks like printed paper, reflects ambient light rather than using a backlight, and holds the image with no power once the price is set. Retailers connect every e ink price tag to a store server through a wireless gateway, so a price change in the back office appears on the shelf in seconds.
Because the price on the shelf comes straight from the pricing database, the e ink price tag removes the gap between shelf price and checkout price. Accurate pricing is the main reason supermarkets, pharmacies and electronics stores switch away from paper. Browse the full range on the electronic shelf labels page.
Photo: AiEInkSmart e ink price tags on a supermarket shelf. (AiEInkSmart customer project)
How Does an E Ink Price Tag Work?
An e ink price tag receives price data from a wireless gateway, rearranges charged ink particles to form the new image, then holds that image with zero power. The e-paper screen contains millions of tiny microcapsules filled with black and white particles. An electric field pulls the right particles to the surface to draw text and numbers, and the particles stay in place after the field switches off.
The update path has four short steps:
Price entry: Staff change a price in the software, or the software pulls the price from the store POS/ERP automatically.
Send: The software passes the update to an ESL gateway mounted on the ceiling.
Refresh: The e ink price tag wakes, receives the data, refreshes the screen in about one second, and confirms back.
Sleep: The tag returns to deep sleep and the bistable screen holds the price with no power draw.
The gateway runs on a dedicated radio band, so price updates never compete with the store Wi-Fi. Developers who need direct control can dock through the MQTT gateway and a documented API.
How Long Does an E Ink Price Tag Battery Last?
A standard e ink price tag runs 5 to 10 years on one CR2450 lithium coin-cell battery at six to ten price updates per day. The long life comes from the bistable e-paper screen, which draws power only during an update and none while holding the price.
| Factor | Effect on Battery Life |
|---|---|
| Update frequency | 6–10 updates/day gives 5–10 years; heavy dynamic pricing shortens it |
| Battery type | CR2450 lithium coin cell is the common choice for its high energy density |
| Temperature | Freezer and cold-store use lowers battery output |
| Color refresh | Full-color updates use more energy than black-and-white |
Source: Electronic shelf label battery life guide, 2026; AiEInkSmart engineering data.
What Sizes and Colors Does an E Ink Price Tag Come In?
An e ink price tag comes in sizes from 1.54 to 13.3 inches and in black-and-white, tri-color, four-color, and full-color (E Ink Spectra 6) versions. Small sizes suit dense grocery shelves; large sizes suit end-caps and electronics. Color choice depends on how much a store needs to highlight promotions.
| Color Version | Palette | Best Use | Product Page |
|---|---|---|---|
| Black & white | Black on white | Standard pricing | White ESL |
| Tri-color | Black / white / red | Sale highlights | Tri-color series |
| Four-color | Black / white / red / yellow | Complex promotions | Four-color series |
| Full color (Spectra 6) | Six pigments, true color | Brand and premium displays | Full-color series |
Source: E Ink, ESL application page; AiEInkSmart product catalog, 2026.
Full-color Spectra 6 uses six pigment particles (black, white, red, green, blue, yellow) and needs 25 to 40 seconds to refresh, so stores use it for eye-catching displays rather than frequent price flips. Freezer aisles use a low-temperature e ink price tag rated down to -25℃; see the low-temperature series.
How Much Does an E Ink Price Tag Cost in 2026?
Most e ink price tags cost US$5 to $20 each in 2026, with full-color Spectra 6 labels running higher. Size, color and order quantity set the final price.
| Label Type | Typical Price (each) |
|---|---|
| 2.13"–2.9" black-and-white | $5–$8 |
| 4.2" tri-color / four-color (BWRY) | $5–$8 |
| 4.2" full color (Spectra 6) | $14–$18 |
| 7.5"–13.3" large format | $18–$50 |
Source: AiEInkSmart 2026 quotation data; Electronic price label technology comparison, 2026.
A gateway ($100–$300) and the management software complete the system, and a mid-size store usually recovers the cost within about two years. To test the full system first, order an e ink price tag demo kit, or request a current price list on the contact page.
Is an E Ink Price Tag Worth It for a Store?
An e ink price tag pays back through lower labor cost, zero pricing errors, and faster promotions. A store that changes paper tags by hand spends 5 to 10 staff hours each week on price updates, and every mismatch between shelf and checkout risks a customer complaint or a fine.
An e ink price tag removes both problems and lets a store run same-day markdowns on short-dated food to cut waste. Walmart is rolling e ink price tags out across the U.S. supercenter network, a strong signal that shelf-edge automation now works at national scale.
FAQ About E Ink Price Tags
Does an e ink price tag need Wi-Fi?
No. An e ink price tag uses a dedicated gateway on a 2.4GHz or 433MHz band, kept separate from the store Wi-Fi, so price updates never slow customer internet.
How fast does an e ink price tag update?
A black-and-white e ink price tag refreshes in about one second. A full-color Spectra 6 label needs 25 to 40 seconds, so stores reserve full color for displays that change less often.
Can an e ink price tag work in a freezer?
Yes. A low-temperature e ink price tag operates down to -25℃ and is built for frozen-food cabinets and cold storage.
What happens when the battery dies?
The e-paper screen keeps showing the last price because the display is bistable. The management software flags the low-battery tag so staff replace the battery before it fails.
Can a small shop use e ink price tags?
Yes. A small shop can start with a demo kit and a few hundred tags at $5 to $8 each, then expand shelf by shelf. Request a quote through the AiEInkSmart contact page.
About the author: Panda Wang is co-founder of PanPanTech (AiEInkSmart), an electronic shelf label manufacturer serving 6,000+ stores in 30+ countries. Published July 2026.
