Tethered AR

See also: Standalone AR, Phone-Powered AR and Tethered HMD

Tethered AR is an augmented reality hardware design in which the worn device, usually a pair of AR glasses or an optical see-through headset, is connected by a cable or short-range wireless link to a separate host that supplies processing, power, or both. The host can be a smartphone, a PC, a games console, a handheld gaming device, or a dedicated wearable compute unit (often called a compute pack or compute puck). Moving the processor and battery off the head lets the glasses stay light and cool, at the cost of a permanent connection to another device.

The approach contrasts with Standalone AR glasses, which carry their own processor, battery, and wireless radios and run without an external host. Tethered AR overlaps with, but is broader than, PC-Powered AR: the host in a tethered system can be a phone or console rather than only a PC, and the tether can carry just a video signal rather than a full compute workload. It is the AR counterpart to tethered VR, where a head-mounted display such as the original Oculus Rift connects to a gaming PC by cable.

Category and terminology

The defining feature of tethered AR is the physical or near-physical dependence on a host device. Most current consumer tethered AR products are wired: the glasses connect to the host with a single USB-C cable that carries video and power, and they have no battery of their own. Reviewers and retailers commonly call this class "tethered" or "display" glasses, distinguishing them from "standalone" glasses that contain a Snapdragon processor, battery, Wi-Fi module, and microphones and run as an independent Android device.

Two distinct levels of tethering exist. In the lighter case the glasses are effectively an external monitor with speakers, and the host runs all software and rendering; this describes most birdbath display glasses. In the heavier case the glasses carry some sensors and silicon for tracking or display driving, but the bulk of computation and the main battery sit in a separate worn pack, as on enterprise headsets like the Magic Leap 2. The brief term "tethered" covers both, the difference being how much of the system lives on the host versus on the head.

How tethered AR works

Wired display glasses (DisplayPort over USB-C)

The most common consumer implementation uses DisplayPort Alt Mode over a USB-C cable. A compatible host (phone, laptop, handheld, or console adapter) sends a video stream over the USB-C connection while delivering power across the same cable, and the glasses drive their twin micro-OLED panels from that signal. The host's USB-C port must support video output over DisplayPort Alt Mode for this to work; devices that output only HDMI, such as many games consoles, require a powered HDMI-to-USB-C adapter that converts the signal.

Because the panels sit a few centimetres from the eye, these glasses use magnifying optics rather than the thin waveguides used in see-through AR. Many rely on birdbath optics, an arrangement in which light from the micro-OLED is polarised, reflected off a spherical mirror, and focused toward the eye to form a virtual image. Some recent models add a small onboard chip purely for tracking and image stabilisation while still relying on the host for everything else; the Xreal X1 chip, for example, performs 3-degree-of-freedom tracking on the glasses with a stated 3 ms motion-to-photon latency, but the One Pro still tethers to a host over USB-C for video and power.

Compute packs and pucks

The heavier form of tethering puts a full processor and battery in a separate unit. The Magic Leap 2 uses a split architecture: a 260 g headset connects by a thin cable to a 425 g Compute Pack worn on a belt or in a pocket, with the pack carrying an AMD quad-core Zen 2 x86 processor and 16 GB of RAM for enterprise rendering and computer vision. Its predecessor, the Magic Leap One, used the same idea with a round, pocket-worn "Lightpack" wired to the headset.

A wireless variant of the compute pack is the compute puck. Meta's Orion AR prototype, shown in 2024, offloads application logic and machine-perception silicon to a wireless puck described by Meta as more powerful than a phone yet smaller than one. Meta's earlier Orion prototypes used a neck-worn unit, internally called "Omega," that was hardwired to the glasses; a Reality Labs wireless team later "cut the tether" to make a pocketable, fully wireless puck, which the company says improved cooling and freed the puck to act as a virtual anchor for holograms and a tracked input device. Meta's stated reason for using a separate puck at all is physical: a director quoted by the company said that with everything on the glasses "you're starting to hit limits on how much heat you can dissipate, how much battery you can compress, and how much antenna performance you can fit."

Tradeoffs

The case for tethering is weight, heat, and battery. Display glasses that offload all computation to a host weigh roughly 75 to 90 g, against around 120 g for a comparable standalone pair that must carry its own processor and battery; the Rokid Max 2 weighs 75 g and has no internal battery at all, drawing power from the host over USB-C. Putting the heat-generating silicon in a separate enclosure also raises the thermal ceiling: Magic Leap's belt-worn pack and Meta's puck can dissipate far more heat than a frame resting on the nose and ears, which lets the system sustain heavier workloads.

The cost is dependence and mobility. Tethered glasses do not function without their host, and a wired display pair draws continuously from the host's battery; one comparison measured a tethered translation pair draining a connected phone by 15 to 20 percent per hour. Wired tethers also constrain movement and add a cable to manage, and a video-only tether can introduce transmission latency on top of the host's own processing time. Host compatibility is a further limit: a phone or laptop must expose DisplayPort Alt Mode over USB-C, and devices that lack it need an adapter. Standalone glasses avoid all of this but pay for it in head weight, on-board heat, and price.

Examples

Product	Host / tether	Compute location	Notable specs
Xreal One Pro	USB-C (DP Alt Mode) to phone, PC, handheld, console (via adapter)	Host, plus on-glasses X1 chip for 3DoF tracking	87 g; 0.55-inch Sony micro-OLED, 1080p per eye; 57 degree FOV; 120 Hz; X-Prism optics
Viture Luma Ultra	USB-C / HDMI-to-USB-C to phone, PC, Steam Deck, or Viture Pro Neckband	Host (plus Neckband option); on-glasses cameras for 6DoF	1200p micro-OLED; 52 degree FOV; 1250 nits; greyscale cameras for 6DoF and hand tracking
Rokid Max 2	USB-C to phone, PC, console; optional Rokid Station Android module	Host (or Station for standalone media)	75 g; Sony micro-OLED, 1080p per eye; 50 degree FOV; 600 nits; 120 Hz
Magic Leap 2	Thin cable to belt-worn Compute Pack	Compute Pack (AMD Zen 2, 16 GB RAM)	260 g headset; 70 degree diagonal FOV; see-through waveguide display
Meta Orion (prototype)	Wireless puck (plus a wireless wristband)	Wireless compute puck with custom silicon	Research prototype; puck handles application logic and machine perception

The display-glasses segment is led by Xreal, Viture, and Rokid, whose products tether over USB-C and are marketed for media viewing, productivity, and gaming on phones, laptops, the Steam Deck, ROG Ally, and consoles through adapters. Some of these straddle the tethered and standalone categories: the Rokid Max becomes a standalone player when paired with the optional Rokid Station, and Viture sells a Pro Neckband that acts as a wearable host.

Current status

As of 2026 the wired display-glasses category is the most active part of the consumer AR market, with Xreal, Viture, and Rokid iterating annually on micro-OLED brightness, field of view, and on-glasses tracking chips. A new direction blends tethered compute with full spatial computing: Xreal's Project Aura, announced at Google I/O in May 2025, runs Android XR from a tethered compute puck built around a Qualcomm Snapdragon chip, with cameras on the glasses for tracking and Google's Gemini AI. At the same time Meta's Orion work points toward wireless pucks for full see-through AR, suggesting tethered compute, whether wired or wireless, will remain common until processors and batteries shrink enough to fit comfortably in an all-day pair of glasses.