Sony is trying to turn personal climate control into something you wear like an accessory, not something that roars in the corner of your room. With the new REON POCKET PRO Plus, the company’s latest “wearable AC” and heater in one, it’s pushing that idea harder than ever – promising stronger cooling, smarter automation and a more stable fit for long days in brutal heat or unexpected cold snaps.

At a glance, the REON POCKET PRO Plus looks like a small, curved gadget that sits at the base of your neck, held in place by a dedicated neckband. Sony’s goal is simple: instead of blasting cold air into an entire room, it wants to quietly manage the temperature of the person, not the space. The device presses a cooling plate against your upper back and uses thermoelectric tech to either absorb heat from your skin or gently warm it, depending on what you need. It’s not new for Sony – the first Reon Pocket appeared back in 2019 as a crowdfunded experiment in Japan – but PRO Plus is pitched as the most capable and refined version yet.

Under the shell, the PRO Plus is all about squeezing more performance out of a tiny surface. Sony says the new thermal design and cooling algorithm deliver up to 20 percent higher cooling performance compared to the previous model, dropping body surface temperature by up to an additional 2 degrees Celsius in its Smart Cool mode. That may not sound dramatic on paper, but reviewers who tried earlier Reon devices have consistently pointed out that the difference between “mildly refreshing” and “actually noticeable relief” in a small wearable is a matter of just a few degrees. In practical terms, the PRO Plus aims to feel less like a cold patch in one spot and more like a subtle, whole-body easing of heat stress as your blood moves past that cooled area.

The “smart” part is just as important as raw cooling numbers. Using a companion smartphone app, you can define your preferred comfort range, and the device automatically adjusts the plate temperature in real time based on onboard sensors that monitor things like movement, ambient temperature and humidity. In Smart Cool or Smart Warm mode, the PRO Plus constantly micro-adjusts instead of blasting at a fixed level, trying to prevent that familiar cycle of “too cold, then too hot again” you get when manually toggling between fan speeds or AC settings. Earlier Reon Pocket models already showed how dramatic this can feel: reviewers noted that the device could respond within seconds when the environment changed, switching to heating or cooling faster than you could dig your phone out to tweak settings yourself.

On the design side, Sony is clearly responding to feedback that these devices need to stay put and stay comfortable if you’re going to wear them for hours. The PRO Plus introduces a new “Adaptive Hold Design” neckband that aims to lock the unit at the right spot on your neck and upper back without digging in or shifting as you move. Sony is positioning it as more stable and ergonomic than earlier bands, which reviewers of previous models liked for their flexibility but still saw room to improve for all-day wear, especially in hot climates where sweat and constant motion can loosen the fit. The overall build is low-profile and fanless, which means it’s meant to disappear under a collared shirt or hoodie without broadcasting to everyone that you’re wearing a tiny air conditioner.

Battery life is another crucial piece of the puzzle. Sony says the REON POCKET PRO Plus can run for up to around 15 hours in Smart Cool mode, a substantial amount of time for something this compact. That won’t cover multi-day camping without recharging, but it is enough to comfortably get you through long commutes, outdoor events, or back-to-back shifts with a single top-up overnight. Earlier Reon Pocket Pro models already pushed battery life to “all workday” territory at lower cooling levels, and PRO Plus leans on improved efficiency rather than simply cramming in a bigger battery. The idea is that by only cooling or heating when the sensors say it’s needed, the device stretches every watt-hour a little further.

It’s also important to remember that the REON line is not just about cooling. The PRO Plus supports both cooling and heating, using a dual thermo-module to switch roles when the seasons change. In winter or over-air-conditioned offices, you can throw it into Smart Warm mode and get localized heat on the same spot where it would usually cool you, smoothing out those uncomfortable temperature swings between outdoor chill and indoor blasting HVAC. That year-round flexibility is a big selling point if you live somewhere with real seasons, not just “very hot” and “slightly less hot.”

Of course, none of this means the REON POCKET PRO Plus can perform miracles. Independent reviews of earlier Reon Pocket Pro devices have been clear: this class of wearable is about comfort, not about rewriting the laws of physics. In extremely harsh conditions – think midsummer desert sun or crowded outdoor festivals at peak heat – the relief is noticeable but limited; it cannot replace a proper air conditioner, and your body will still sweat and struggle if the environment itself is far beyond human comfort range. Where the tech shines is in more typical everyday scenarios: walking between buildings, commuting on stuffy trains, working in a warehouse, or sitting in a drafty office where the central AC never seems to be set for you.

The PRO Plus also fits into a larger story Sony likes to tell about sustainability and “cooling the person, not the room.” If individuals can stay comfortable without having to crank down the thermostat for an entire space, there’s a potential energy-saving angle, especially in workplaces or homes where people have very different temperature preferences. Sony has been positioning the Reon series as part of its broader environmental vision, arguing that personal climate wearables could help reduce over-reliance on power-hungry AC systems by allowing more granular, person-level comfort control. It’s a bold claim, and the real-world impact will depend on scale and usage patterns, but the direction is clear: more sensors, more personalization, less brute-force cooling.

The launch of the REON POCKET PRO Plus also shows how this once-niche gadget has quietly gone global. The original Reon Pocket started as a Japan-only curiosity for commuters, but successive generations have spread to more markets in Asia, Europe and the Middle East, and now the PRO Plus is slated for a wider rollout, including the U.S. via Sony’s online channels starting summer 2026. Along the way, Sony has iterated through multiple versions – from the early crowdfunding model to the Reon Pocket 5 and the first Reon Pocket Pro – each adding better cooling modules, longer battery life and more refined software. The Plus badge signals that this is a flagship-tier device, bundling the wearable unit with its dedicated neckband and a REON POCKET TAG accessory to help the system read the environment more accurately.

If you’re wondering whether this is something you’d actually use, it helps to think of the PRO Plus less as a gadget you constantly fiddle with and more as a background comfort layer. The app lets you dial in preferences and modes, but the value really shows up when you can forget about it – when it quietly ramps up cooling as your commute gets hotter, then backs off in the shade, or gently switches to warming as your office AC kicks into overdrive. Early testers of previous Reon Pocket devices noted that once the novelty wears off, what remains is a subtle but persistent sense that the environment is “just a bit more manageable” than it would be without it, which is precisely the type of tech you only miss when it’s gone.

The big question now is whether PRO Plus finally crosses the line from “interesting niche gadget” into “everyday tool” for people in hot and cold climates alike. On paper, it makes meaningful strides: more cooling power, smarter algorithms, better fit, and solid battery life. Whether that’s enough to justify the cost will depend on your lifestyle – if you spend a lot of time outdoors, commuting, or working in temperature extremes, there’s a clear argument that a discreet personal climate device might be as essential as noise-cancelling headphones or a smartwatch. If your days are spent mostly in well-regulated indoor spaces, it might remain a fascinating, clever piece of tech that solves a problem you only have a few weeks each year.