Optoma Photon Go PH31UST 100" Full HD Smart Portable Ultra Short Throw DLP Projector with Speakers

Ultra short throw projectors usually demand a fixed wall, a darkened room, and a permanent installation — but the Optoma PH31UST tears up that rulebook. Place it just centimetres from a flat surface and it throws a 100-inch Full HD image without the cabling, ceiling mounts, or compromised viewing angles that conventional projectors require. The built-in battery, Android smart platform, and onboard speakers mean you can move it from living room to garden to a friend's house without carrying anything beyond the unit itself — a genuinely rare combination at this size and resolution.

Who Is This For?

This projector suits renters, flat-dwellers, and anyone who wants large-screen viewing without drilling a single wall. It's equally strong for outdoor movie nights or impromptu presentations where wheeling in a large TV isn't practical. If you want a dedicated home cinema with 4K HDR and a fixed screen, you'll want to look elsewhere — the Full HD resolution and brightness limitations in fully lit rooms mean this isn't a substitute for a proper install. Check our best TV deals if a permanent large screen is the real goal.

What Buyers Say

Owners consistently praise the portability and the genuinely short throw distance, which works as advertised even in small rooms. The Android interface draws positive marks for responsiveness, with Netflix and Disney+ running without workarounds. The most common complaint is battery life — real-world runtime falls noticeably short of Optoma's headline figure under brighter output settings — and audio, while convenient, lacks the low-end weight that a dedicated soundbar would provide.

The Deal

The PH31UST is currently £599.00, reduced from £699.99 — a saving of around £101. This is a newly tracked product, so there's no historical price data to confirm whether £699.99 is a genuine long-term RRP or a short-lived pre-discount figure. At £599, the price is competitive for a portable ultra short throw with smart TV functionality built in, but hold off if you can — establishing a price baseline over a few weeks would tell you whether this discount runs regularly.