1) Internal references & platform options

Before placing a bulk order, align the target platform and UI:

• Brand/theme hub for parts & shells: melt packman
• Two-flavor switching options: dual chamber vape
• Status displays & counters: LED screen vape
• Capacity class overview: 2g disposable vape pen
• Comparable platform for benchmarking UI/selector logic: Choices Lab

2) Functional testing (bench & acceptance)

Selector & UI logic

• Cycle A→B→(Dual, if present) 10×; confirm the on-screen state each time.
• Check lock/unlock: long-press timing, lock icon feedback, and accidental toggle immunity in pocket-jostle tests.

Power, preheat & indicators

• Record preheat duration on screen vs. stopwatch (±10% tolerance). Log temperature drift indirectly via puff consistency and cutoff behavior.
• Verify USB-C handshake on 5V/1A wall bricks and common power banks; confirm charge LED/percent increments.

Safety baselines (design intent)

• Request evidence of evaluation to the spirit of UL 8139 (electrical/heating/battery/charging systems). Keep excerpts or a letter of conformity in the PO folder.
• Require a UN 38.3 Test Summary for the exact cell/pack model referenced on labels.

3) Shipping & regulatory labels

For lithium-powered units, labels must consistently reflect battery classification and route. Minimum expectations for air freight:

• Lithium battery mark & proper shipping name aligned to current IATA guidance (with SoC policy and UN numbers as applicable).
• Orientation arrows on fiberboard outers when required; avoid obstruction by stretch wrap.
• Manufacturer’s UN 38.3 Test Summary access via URL/QR on the pack list or carton label.

For pallet and master-case traceability, apply GS1 logistic labels (SSCC with human-readable text) at consistent positions for scanners on both short and long sides.

4) Packaging tests & carton markings

Use a transit test appropriate for parcel carriers and mixed air/ground moves. ISTA 3A is a common general simulation for individual packaged products. Pair with your device’s vulnerability points (mouthpiece seams, screen, selector slider):

• Drop: edge/corner/face sequences; verify no screen cracking or selector binding.
• Random vibration: include low-pressure option (simulated altitude) for air segments.
• Compression: confirm master-case integrity and tray retention; check scuffing on displays.

Carton markings: Model, lot/serial range, net units, gross weight, country of origin, and battery handling mark when applicable. Add “Do not stack” or top-load limits if palletization height is a risk.

5) Documents to request before shipment

• UN 38.3 Test Summary PDF referencing the exact cell/pack (model, manufacturer, test house, and pass dates).
• IATA Lithium Battery Guidance alignment note from your forwarder (packing instruction, SoC limit, marks/labels).
• UL 8139 evidence (evaluation report excerpt or letter of conformity) for the platform’s electrical and charging design.
• Commercial invoice with correct HS codes and model identifiers matching carton markings.
• GS1 label spec sheet (placement, SSCC range owner) to keep receiving workflows consistent across warehouses.

6) Receiving checklist (fast QA)

• Photograph pallet labels and master-case GS1 labels before teardown; verify SSCC and lot alignment with paperwork.
• Randomly sample ≥3% (min. 20 units). Log A/B switching, preheat timing, battery indicator steps, and screen legibility.
• Inspect mouthpiece seals and selector tracks for burrs; quarantine if failure rate >1%.
• Run a 10-unit mini-ISTA (drop + short vibration) for packaging drift checks on each incoming lot.

Reminder: This checklist is for empty hardware only. Follow jurisdictional rules for labeling and shipment of lithium-powered devices; retain all documents in the PO folder.

7) FAQ

Do LED-screen models reduce RMAs?

Often yes; live feedback for battery %, preheat timers, and A/B state helps support teams diagnose issues without unnecessary returns.

Can we mix dual-chamber and single-chamber units per PO?

Yes, but keep the electrical platform consistent to simplify QA, spare parts, and after-sales workflows.