Bethesda
By Matt Peckham
July 2, 2015

The Fallout 4 limited edition, honking big, bona fide replica Pip-Boy won’t work with the iPhone 6 Plus, in case you’re rocking Apple’s 6.22-by-3.06-inch phablet.

Mind you, Fallout developer Bethesda’s $120 not-so-smartwatch, modeled after the gigantic arm-computer players wear in the series, still looks like something a Ghostbuster might strap on — the antithesis of fashion feng shui, but kind of cool anyway. It’s for diehard fans of the upcoming post-apocalyptic free-for-all, which is to say, probably not you.

But even if you are secretly jonesing to cosplay one of the game’s survivors, you’ll need a phone smaller than 6 inches to get the thing to actually do something recognizably Pip-Boy-like via Bethesda’s companion iOS and Android app. The list of compatible smartphones includes all models of the iPhone from 4 until the iPhone 6. You can apparently insert foam to jury-rig a snug fit for other devices, but the top-end size to jam a phone into the Pip-Boy’s frame is 6 inches. That, among others, means no to the Huawei Ascend Mate 7, no to the Nokia Lumia 1520, and definitely no to Sony’s monstrous Xperia Z Ultra.

The Pip-Boy is essentially a green-screen gauntlet, an old-school IBM mainframe screen you clap to your arm. In the game, it’s the interface to all the fiddly roleplaying minutia like characters stats and inventory. It’s also a pretty slick portable radio, say you want to listen to the Ink Spots croon something ironic as you probe the game’s post-nuclear mutant-scape. The limited edition replica version is mostly fan service most likely to grace display shelving. But if you really want your second screen experience served on your forearm (and you managed to snag one of the things before they sold out), bear in mind it’s not phablet-friendly.

Write to Matt Peckham at matt.peckham@time.com.

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