The input range on the device decides it

Every plug adapter in this comparison says the same thing in its own listing. EPICKA’s TA-105 Pro is rated 100-240V input and does not convert voltage. OREI’s M8-45W accepts 100-240V. TESSAN’s WTA05 is rated 100-250V and the listing states it is not a voltage converter. Anker’s A9215 is compatible with 100-240V devices and says voltage conversion is not supported. The adapter survives the foreign socket; whatever you plug into it receives that socket’s voltage unchanged.

So the decision is made before you look at a single adapter. A range of 100-240V means the device already accepts the voltage at the destination and needs only the plug shape changed. A rating of 110-120V only means the device needs the voltage changed, and only three products here do that: BESTEK’s converter and Simran’s SMF-200 step 220V down to about 110-120V, and Seven Star’s THG-2000 steps both ways between 110V and 220V.

Why the pass-through wattage misleads

TESSAN publishes a 2500W, 10A maximum for the WTA05’s AC socket. Anker publishes separate pass-through ceilings for the A9215, listed in the comparison table. These are the loads the socket will carry, and they are useful figures because EPICKA and OREI publish no AC ceiling at all for their adapters. But they describe pass-through, not conversion. The TESSAN listing’s own disclaimer makes the point: high wattage on an adapter does not turn it into a converter.

On the converter side, the wattage figure splits in ways the headline hides. BESTEK’s 2000W applies to one primary outlet, the one that steps voltage down. Its second outlet is limited to 200W and does not convert voltage at all; the listing describes it as intended for dual-voltage electronics. Plug a 110-120V appliance into that second outlet and you have the same situation as a plain adapter. Simran’s SMF-200 converts on every watt it offers, but it offers 200.

The number to match is the printed draw on the appliance against the outlet that actually converts. A 200W converter is a different product from a 2000W one, not a smaller version of the same thing.

The exclusion list is where the real trade-off sits

This is the detail that catches people. Simran’s listing advises against hair dryers, hair straighteners, power tools and other household appliances altogether, and warns that TVs, heating appliances, laser printers, halogen and fluorescent bulbs and power tools cause voltage spikes on startup. BESTEK’s Amazon listing states that DC-motor hair dryers and Dyson-type products are not supported.

The listings do not explain the reason for these exclusions, and this article will not supply one. What matters for the purchase is that a wattage rating is a load ceiling and not a compatibility promise. The only route the adapter listings address is a device rated 100-240V.

Plug shapes: the same four letters on every adapter

The four adapters publish the same four plug types, listed in the comparison table. EPICKA is the one brand that names what is missing: Type D for India and Type M for South Africa are not included. The other three do not list those types either; they simply do not call out the gap.

The converters are narrower. BESTEK ships with a Type C plug for Germany, France, Italy and Spain; the UK Type G version is a separate ASIN, so confirm the plug type on the listing before buying. Simran ships with a 2-round-pin Euro plug only, and its listing says UK, Australia, New Zealand and Singapore require a separately purchased adapter. The Seven Star listing names a grounded US plug input jack and no regional output plug types at all, so its destination fit cannot be confirmed from the documentation.

A converter for a UK trip therefore means BESTEK’s UK variant, or Simran plus a Type G adapter carried alongside it. Match the plug types to each stop on the itinerary before the wattage, because the wattage is irrelevant if the unit does not fit the wall.

Grounded plugs are mostly unaddressed

Anker is explicit: the A9215’s AC outlet is 2-pin only and does not accept EU Schuko, UK 3-pin or grounded laptop chargers. EPICKA, OREI, TESSAN, BESTEK and Simran publish nothing on whether their outlets take a 3-prong plug. That is a gap across the category, and it is a reason to prefer charging a laptop from a USB-C port on the adapter where the published wattage allows it.

USB output decides the electronics-only trip

When everything you carry charges over USB, the AC socket is secondary and the USB figures decide. TESSAN publishes up to 140W on USB-C1 and C2, with the USB-A port and a third USB-C port capped at 18W each. EPICKA has three USB-C ports and publishes up to 70W PD on USB-C1 only, plus 2.4A on each of two USB-A ports. OREI publishes 45W total across three USB-C PD ports and two USB-A, adjusted by its Smart IC, with no per-port breakdown. Anker publishes 20W on USB-C1, 15W on USB-C2, 12W on each USB-A, a total USB max of 20W, and a combined cap of 15W when multiple ports share the load.

The shared-cap figures matter more than the peaks. Anker’s 20W is a single-port maximum; charge two devices and the published ceiling is 15W between them. OREI’s 45W is the whole-unit total, so three devices plugged in share it.

When the adapter is genuinely enough

If every device in your bag is marked 100-240V, an adapter is the complete answer. Choose among the four on USB output and the grounding question: TESSAN for its 140W USB-C figure, EPICKA for 70W on one port with two spare fuses included, OREI for three USB-C ports at the lightest published weight among three-port units, Anker for the smallest footprint with a 2-pin charger and phone-class charging.

The adapter stops being enough the moment one device is rated 110-120V only. Then the converter is chosen by three published figures in order: whether it fits the destination socket, whether its converting outlet is rated above the appliance’s printed draw, and whether the listing excludes that appliance. Simran covers a single small electronic device under 200W at Euro-plug destinations. BESTEK covers an appliance under 2000W at Type C destinations, with a 200W pass-through for a dual-voltage charger. Seven Star covers 2000W in either direction with a grounded US input and no stated destination plug types.