This guide is for agents quoting hardware for a business that takes payments away from a fixed Wi-Fi network: food trucks, trailers, farmers-market stalls, pop-ups, festival vendors, mobile detailers and anyone else who works out of a vehicle or a tent. For the full catalogue of devices and the rules behind every quote, see Stackably hardware options and bundles (Sunmi).
The short version
P3H or P3 MIX, your call, with a Stackably SIM card. The SIM ($20 per month) is what makes the device work without Wi-Fi.
The terminal prints the receipts. No network, no Ubiquiti in a truck.
Ticket for the cook: a network printer by USB into the P3 MIX. It sits in the truck on a cable; no network needed.
P3 MIX when they want a cash drawer, a customer-facing display or that ticket printer. P3H when they want the smallest, lightest thing that takes a card and prints.
Keep it in the cradle between orders. Battery is 4 to 6 hours of active use on the P3H; the cradle keeps it topped up off the truck's power.
The builds to quote
Compact | Full counter | |
Terminal | P3H + SIM card | P3 MIX on swivel cradle + SIM card |
Receipts | Built in (58mm) | Built in (80mm) |
Ticket for the cook | Not supported on the P3H; read the order off the screen | Network printer by USB (optional). No network. |
Customer-facing / tips | Hand the device through the window | Swivel the cradle, or add the 6.7" CFD |
Cash drawer | Not supported on the P3H | Sunmi MAX or third-party drawer (optional) |
Ubiquiti network | No | No |
Best for | Small trucks, carts, tents, anyone who wants one thing to grab and go | Trucks with a real counter, a cook who wants paper tickets, cash-heavy events, bigger menus with modifiers |
The network rule, in food-truck terms
There is no network in a truck. Stackably is cloud based; the SIM card gives the terminal its own internet, and the terminal prints its own receipts. A ticket printer for the cook plugs into the P3 MIX by USB, so it needs no network either. Nothing in a truck sits out of reach of a USB cable, so Ubiquiti never goes on a mobile quote.
The SIM card is the whole networking story. $20 per month per card, unlimited data, installed and activated before the device ships. One SIM per device. Inside a building with Wi-Fi the device will use the Wi-Fi; outside, it falls to cellular on its own.
Signal is the merchant's variable, not ours. The SIM depends on cellular coverage where the truck parks. Ask about their usual spots. A truck that works dead zones is a bad fit; there is no offline mode.
Accessories for mobile businesses
SIM card. Required. $20 per month per device.
Cradle. Ships with both devices. In a truck, the cradle is the charger: plug it into the truck's inverter or shore power and set the device in it between orders. The P3H runs 4 to 6 hours of active use on battery; cradling it between customers covers a full shift.
Network printer by USB. P3 MIX only. A Sunmi 80mm Kitchen Cloud Printer on a USB cable to the P3 MIX, mounted where the cook can see it. Grease- and water-resistant, with a sound and light alert for new tickets. No network.
6.7" CFD. P3 MIX only. A fixed customer screen in the window for tipping without handing the device out. Additional charge.
Cash drawer. P3 MIX only. Sunmi MAX or the third-party drawer we resell (confirm model with the Stackably team). Many trucks skip it and use a cash box.
Edge cases
"They want a ticket printer for the cook in the back of the truck." P3 MIX with a network printer by USB. The cable runs from the window to the cook line; no network, no Ubiquiti. Not possible on a P3H, which takes no accessories.
"They have two service windows." Two devices, each with its own SIM. Both on the same merchant account. Orders from both land in the same reports. If both windows should feed one ticket printer, it plugs into one of them by USB and the other device's orders reach it through the cloud only if that device is on our network, which a truck is not; quote a printer per device or have the cook read the second screen.
"They have a truck and a brick-and-mortar." One quote per location. The truck gets a P3H or P3 MIX + SIM; the shop gets whatever its vertical calls for. If the shop has Ubiquiti and a kitchen printer, orders taken on the truck device can route to the shop's printer through the cloud.
"They do festivals with no cell signal." Not a fit. Stackably has no offline mode; a device with no signal cannot take cards. Be direct about it.
"They only work events with venue Wi-Fi and don't want to pay for a SIM." Possible, but venue Wi-Fi is the most common cause of a dead terminal at an event. Recommend the SIM anyway; the device will prefer Wi-Fi when it is good.
"They want to scan packaged goods at a market." P3 MIX with the handheld scanner. The P3H takes no scanner.
"They sell by weight at the market." P3 MIX with the Brecknell scale.
"The device dies mid-shift." It was not in the cradle between orders. Confirm the cradle is powered from the truck and staff are docking it.
"They want the bigger device but worry about the size in a small window." The P3 MIX has a hand hold on the back and is meant to be carried; it is bigger than the P3H but still a one-hand device. If the window is truly tight, P3H.
"They want a receipt printer at the window and the terminal inside." The receipt printer is inside the terminal, so hand the device to the window or mount the P3 MIX cradle at the window. A second printer by USB can sit at the window for receipts if they insist, but it is simpler to bring the device to the customer.
Quick answers
Which terminal? P3H or P3 MIX, your call. P3 MIX if they want a drawer, CFD or a ticket printer.
Do they need a SIM? Yes, $20 per month per device.
Do they need Ubiquiti? No. Nothing in a truck is out of USB reach.
Ticket printer for the cook? Network printer by USB into the P3 MIX. No network.
Tips? Hand the P3H through the window, swivel the P3 MIX, or add the 6.7" CFD to the P3 MIX.
No signal? No sale. There is no offline mode.