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LOBBY
Hardware· 8 min read

Using the Seeed reTerminal E1001 as a Meeting Room Display

The Seeed reTerminal E1001 is a 7.5-inch monochrome e-paper display in a metal case for about USD 69. It is the e-ink panel we now recommend for meeting rooms. Here is what it is, what it can and cannot do, how it actually mounts, and where it beats and loses to the alternatives.

The Seeed reTerminal E1001 is a 7.5-inch monochrome e-paper display in a metal case, built around an ESP32-S3, with a 2000 mAh battery and a price of about USD 69. It runs TRMNL firmware, which means it runs Lobby. It is the e-ink panel we now recommend for meeting rooms.

This post is the honest version: what it does well, what it does not do, the two things it loses to a TRMNL on, and how it actually attaches to a wall — which is the part nobody documents properly, including Seeed.

What the reTerminal E1001 is, in 60 seconds

It is a finished, boxed e-paper display aimed at makers and dashboard builders, which happens to be very well suited to sitting beside a meeting room door.

  • Screen. 7.5 inch, 800 by 480, monochrome e-paper with 4-level greyscale. It supports partial refresh, so an update takes 2 to 5 seconds rather than a full-screen flash.
  • Brains. ESP32-S3 with 8 MB PSRAM and 32 MB of flash, plus a microSD slot up to 32 GB.
  • Radio. 2.4 GHz Wi-Fi b/g/n and Bluetooth LE 5.0. No 5 GHz — see the caveats below.
  • Power. 2000 mAh battery, charged over USB-C.
  • Case. Metal, 176 by 120 by 53 mm with the stand attached, 17 mm deep without it. 218 g.
  • In the box. The display, a USB-C cable, a 3D-printed desk stand with a screw, and a screwdriver.

It carries FCC, CE, TELEC PSE, RoHS and UKCA marks, and Seeed publishes the schematics and a full 3D model of the enclosure. At the time of writing it scores 90.58 out of 100 across 31 reviews on Seeed's own store.

Why this matters for meeting rooms

Most room-display vendors sell you their panel and their software together, and the panel only ever runs their software. If you leave, the hardware is a paperweight.

The reTerminal takes the other approach. You buy the hardware once, and you choose what runs on it: TRMNL's cloud, a self-hosted server, Home Assistant, ESPHome, or something you write yourself in Arduino or ESP-IDF. Lobby is one of the options, not the only one. That is deliberate, and it is the main reason we recommend it.

What it does well as a room display

  • Battery life. 3 to 6 months on a single charge in normal use, depending on how often it refreshes. E-ink draws power only when the image changes, so there is no cable to route to the door and nothing to plug in.
  • Readability. 800 by 480 monochrome e-ink reads like a printed sign from about 5 metres at door height. No glare, no backlight competing with the overhead lights, no dark screen that makes people wonder whether it is broken.
  • Build. The case is metal. At this price that is unusual, and it is the single most noticeable difference in the hand against a plastic-cased panel.
  • It hangs on one screw. There is a keyhole slot moulded into the back. More on this below, because it is genuinely the easiest mounting story of any room display we have used.
  • It is not locked to us. If Lobby stops suiting you, point it somewhere else. TRMNL's self-hosted server route needs no licence at all.

What it does not do

  • Touch. The panel is not a touchscreen. Booking happens by scanning the QR code with a phone, not by tapping the wall.
  • Colour. Monochrome, with a few greys. Fine for a status sign, useless for brand video.
  • Instant refresh. E-ink updates are measured in seconds, and Lobby refreshes on a schedule — every 15 minutes on Free and Unlimited, every 5 minutes on Pro. A booking made thirty seconds ago may not be on the wall yet.
  • PoE. No power over Ethernet. Battery and USB-C only.
  • 5 GHz Wi-Fi. 2.4 GHz only. If your office has no 2.4 GHz SSID, this is a blocker, not an inconvenience.
  • MDM. It does not enrol in Jamf or Intune. If every endpoint in your organisation must be centrally managed, this is the wrong device.

How it actually mounts

Seeed ships it with a fixed-angle desk stand and sells no wall mount, which makes the product page look like wall mounting is not supported. It is — Seeed just never documents it. There are three separate mounting features on the back:

  • A keyhole hanging slot on the vertical centreline: a 10 mm entry hole narrowing to a 4.4 mm slot, with the top of the slot 23 mm below the top edge. Drive one screw into a plasterboard plug, leave the head standing 3 to 4 mm proud, and hang the panel on it. That is the whole installation.
  • Four M3 points in a 75 by 106 mm rectangle, which is what the community-designed frames bolt into.
  • One M3 insert at bottom centre, for the supplied desk stand.

⚠️ 75 by 106 mm is not VESA. It is close enough to VESA 75 (75 by 75 mm) to be mistaken for it, and it will not fit a VESA 75 plate — one pair of holes lines up and the other is 31 mm out. Measure before you order an adapter.

At 218 g the panel is also well inside the rating of a 3M Command small strip, so adhesive mounting works on glass, partitions and painted plasterboard if you cannot drill. That is the option to use in a leased office.

If you want a flush, finished look, the community has published frames: a hook-style wall mount that needs no device screws at all, a frame that keeps the keyhole accessible, and a frame with front-facing buttons for panels mounted high enough that the top buttons are awkward.

One warning if you bolt a frame to the four M3 points: those screws also clamp the rear cover, and the antenna cable connects to that cover. Re-clamp it properly rather than leaving it loose.

The realistic cost per room

  • Hardware. USD 69 per display at 1 to 9 units, dropping to USD 62.99 at 10 or more, bought direct from Seeed. Lobby takes no markup and does not resell it. Seeed ships from US, EU (Germany) and China warehouses; prices vary slightly by region, and the German warehouse delivers within the EU only.
  • Mount. One screw and a plasterboard plug, or a few pounds of adhesive strips. A printed frame if you want one.
  • Software. Lobby is free forever for up to 3 active displays, with all features and no credit card. Beyond that, Unlimited is USD 30 per month billed yearly and Pro Unlimited is USD 60, both for unlimited rooms and displays. No annual contract. All on our pricing page.
  • Setup. About two minutes to flash the firmware, then a couple of minutes per room to pair and connect calendars.

For ten rooms that is USD 629.90 of hardware, once, plus USD 360 a year of software. A purpose-built proprietary room panel typically starts around USD 900 per room before any subscription at all.

How it compares to a TRMNL

We used to recommend the TRMNL OG, and it is still a good device that still works with Lobby. Both run the same firmware and drive the same 7.5-inch 800 by 480 monochrome panel. The differences that matter:

  • Price. USD 69 against USD 139, and USD 62.99 against USD 119 at ten or more. Roughly half, either way.
  • Case. Metal against polycarbonate and ABS.
  • Silicon. ESP32-S3 with 8 MB PSRAM against an ESP32-C3 with 400 KB of RAM.
  • Battery. 2000 mAh as standard against 1800 mAh, though TRMNL sells a 2500 mAh upgrade.
  • Certifications. The Seeed adds TELEC PSE and UKCA to the FCC, CE and RoHS marks both carry.

Two things the TRMNL wins, and they are real:

  • It is simpler to set up. A TRMNL installs Lobby from its plugin store. The Seeed needs about two minutes of one-time flashing per device first. Easy, but it is a step.
  • It is lighter. 120 g against 218 g. Irrelevant if you are hanging it on a screw, worth knowing if you are relying on adhesive.

Neither is worth paying double for, which is why we changed our recommendation. But if you already own TRMNL devices, there is no reason to replace them, and we will keep supporting them.

Two things worth knowing before you order

Turn off automatic firmware updates. Seeed's own guidance for running TRMNL firmware on the reTerminal is to disable both "Firmware Early Release" and "OTA Updates Enabled", because TRMNL's over-the-air updates target TRMNL's own hardware and may leave a reTerminal unresponsive. The practical consequence is that you do not get automatic firmware updates in this configuration. Plan to update deliberately rather than never.

Confirm the warranty terms with Seeed before a large order. Seeed's returns and warranty policy page was not reachable when we checked, and there is no warranty page for the reTerminal E line specifically. We are not going to guess at a figure. For one or two units it does not matter much; for twenty it is worth an email.

Who should not use it

  • You need people to tap the wall to book. Buy a tablet or an appliance.
  • Your office has no 2.4 GHz SSID, or runs 802.1X on every network with no exceptions.
  • Every endpoint must enrol in your MDM.
  • You need colour, or the panel doubles as signage.
  • You need a named vendor with an SLA and a support contract, rather than a component supplier.

For everyone else, it is the best-value e-ink signage hardware we have found.

Put Lobby on it

Lobby is the software layer that turns the panel into a room display. It reads your Google Workspace or Microsoft 365 room calendars, read-only, renders a clean status screen, and serves it to the display on schedule. Free forever for up to three displays.

See the hardware options, compare e-ink against tablets and TVs, or get started.

TL;DR

The Seeed reTerminal E1001 is a 7.5-inch monochrome e-paper display in a metal case for about USD 69, running an ESP32-S3 with a 2000 mAh battery that lasts 3 to 6 months per charge. It hangs on a single screw via a keyhole slot on the back, or on adhesive strips at 218 g. No touch, no colour, no PoE, no MDM, 2.4 GHz only.

Against a TRMNL it is half the price, metal instead of plastic, on faster silicon, with a slightly larger standard battery — and it loses on setup simplicity and weight. Pair it with Lobby, free for up to 3 displays and USD 30 a month flat for unlimited, and a ten-room office costs USD 629.90 once plus USD 360 a year.

Related reading

Sources

Hardware prices and specifications captured 29 August 2026. Vendor pricing changes and varies by region — confirm directly before ordering.

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