Glasses hardware

This page covers what the glasses report about their own hardware over the protocol. It covers identity, camera output, sensor logs, storage, battery, case, thermal state, hinge, controls, LEDs and self-checks.

Product id	Name	Codename
258	Ray-Ban Meta (2023)	hammerhead
259	Meta Ray-Ban Display	greatwhite
262	Ray-Ban Meta Optics	zebra
263	Meta glasses	lager
264	Oakley Meta Vanguard	mako
265	Oakley Meta HSTN	pylades
266	Ray-Ban Meta Gen 2	greathammerhead

The glasses' device codename in the build fingerprint selects the product id. Every model in the table uses the same protocol. Values below that belong to one model name it.

Identity

The glasses report their device codename on svc100 field 8. On Ray-Ban Meta Gen 2 it is greathammerhead, which is product 266.

The product codename is the second part of the build fingerprint. On Ray-Ban Meta Gen 2 it reads hammerhead, the codename of product 258. The reason is unconfirmed.

The hardware stage is on svc100 field 7. On Ray-Ban Meta Gen 2 it reads PVT.

The build string is on svc100 field 1. See Firmware. The serial number is on svc100 field 2. This page does not give its value.

Frame style and lens color

The glasses do not report the frame style, frame color, lens color or size. The phone asks Meta's server for them with the serial number and the AR token from the Meta login. The answer gives a code and a display name for each part, such as WAYFARER and SHINYBLACK.

Camera output

The table gives the output on Ray-Ban Meta Gen 2.

Output	Value on Ray-Ban Meta Gen 2
Full-resolution still	HEIC, 4032x3024 (12.2 MP). A grid of 48 HEVC tiles of 512x512 in 8 columns and 6 rows, cropped to 4032x3024
Still orientation	Exif orientation 6. The image is stored landscape and needs a 90 degree clockwise turn
Still size	1,082,463 bytes in one capture. About 0.5 to 1 MB in other captures
Thumbnail	JPEG, 320x240, 12,216 bytes in one capture
Video	HEVC, 1728x2304 (portrait), 30 frames per second. Clips of 8.43 s (14.9 MB) and 11.64 s (20,787,909 bytes)
Video audio	AAC, 48 kHz, stereo
Live photo clip	HEVC, 1728x2304, about 1.6 s and 23 frames, variable frame rate, on capture kind 0

Each still is a HEIC file. The full-resolution still is not a JPEG. The thumbnail is a separate small JPEG.

A photo capture carries two assets of kind 2: the thumbnail and the full-resolution still. The capture list tells them apart by size only. A video capture carries one still, its poster frame. See Capture-list.

In the capture list a live photo has no kind field, which reads as 0. Plain photos are 3073 and videos are 3074. On Ray-Ban Meta Gen 2, photos taken in October 2026 all arrive as live photos.

The Meta AI app offers three video settings: 1080p at 30 frames per second (the default), 1080p at 60 and 3K at 30.

Sensor logs

Each capture carries two sensor logs.

Log	Record	Fields
IMU log, asset kind 3	38 bytes at about 957 Hz, median step 1,044,333 ns	Sequence number, timestamp in nanoseconds, accelerometer x, y and z in m/s2, gyroscope x, y and z in rad/s, IMU die temperature in degrees Celsius
Frame log, asset kind 4	18 bytes, one per video frame	Frame number, timestamp in nanoseconds, exposure time in nanoseconds

The sizes and rate are confirmed. The accelerometer field names are inferred from physics. The accelerometer magnitude averages 9.82 over a still capture. An 11.60 s clip has 349 frame records, 30.01 Hz.

The IMU temperature is the sensor's die temperature, not the air. It rises during a recording and stays flat when the glasses are idle. The glasses have an ambient light sensor and no air temperature sensor.

Storage

svc28 field 21 reports the free and total storage in megabytes. Field 11 gives a storage level: UNDEFINED, STABLE, LOW or ZERO. Field 21 is free space, not used space. On Ray-Ban Meta Gen 2, one reading showed 20317 MB free of 21822 MB total.

Battery and case

svc28 pushes a battery state on field 1 and a case battery state on field 2.

Battery state, field 1:

1. Field 3 is the charge level in percent.
2. Field 2 is the charge state: NO_DATA, CHARGING, CHARGING_FULL, CHARGING_LOW or NOT_CHARGING.
3. Field 1 is the health: UNKNOWN, NORMAL, WARNING, CRITICAL, SHUTDOWN or EMERGENCY_SHUTDOWN.
4. Field 4 is the temperature in milli-degrees Celsius. Field 5 is the voltage in millivolts.

On Ray-Ban Meta Gen 2, one reading showed 100 percent, not charging, 4.48 V and 28.9 degrees Celsius.

Case state, field 2, is the glasses' last reading of the case. The glasses know the case only through the charging pins.

1. The case level is known when it lies between 0 and its scale. The scale is 4 for bars and 100 for percent.
2. After a long time out of the case, the level is -1, the serial is empty and the firmware reads 0.0.0. The phone then has no case reading.
3. Field 8 says whether a case is present. Field 10 says whether liquid is detected in the case. Field 6 flags an incompatible charger.

On Ray-Ban Meta Gen 2, one reading showed the case at 80 percent with the glasses out of it. The case reported firmware 12.14.7 and platform COCOS. The case firmware is not the glasses' firmware. See Firmware.

Thermal state and throttling

svc28 field 13 carries the thermal state. Field 1 is the health: UNKNOWN, NORMAL, LIGHT, MODERATE, SEVERE, CRITICAL or SHUTDOWN. Field 3 says whether throttling is on, and field 4 gives a reason code.

Field 2 reads 0 in every push seen so far. Its unit is unknown.

Field 15 carries the peak power levels, named THROTTLE_LEVEL_1 to THROTTLE_LEVEL_3 and SHUTDOWN in Meta's app.

On Ray-Ban Meta Gen 2, large transfers paused without an error at 11 percent battery and the same asset resumed once the glasses were charged. See Airship-file-transfer. Unconfirmed: whether peak power throttling causes the pause, because the throttle level was never read back.

The glasses' thermal configuration names a skin sensor for throttling.

Hinge, mount and wear

Field	Values	Meaning
Hinge, field 6	UNKNOWN, OPEN, CLOSED	Whether the arms are folded. On Ray-Ban Meta Gen 2, CLOSED while the glasses charge in the case. OPEN was read at another time
Mount, field 9	NONE, DON, DOFF	Worn, taken off, or no reading. DON means worn
Overhead, field 39	Boolean	Set when the glasses are overhead. Unconfirmed: whether the glasses send it

Touch pad and buttons

Control	Field	Values	Notes
Touch pad	svc28 field 5	SINGLE_TAP, DOUBLE_TAP, TAP_HOLD, SWIPE_BACKWARD, SWIPE_FORWARD, SLIDE_BACKWARD, SLIDE_FORWARD, TRIPLE_TAP, PALM_TAP, PALM_HOLD, plus two presence values	Unconfirmed: which of them a tap sends
Capture button	svc28 field 4	SHORT_PRESS_DOWN, SHORT_PRESS_UP, LONG_PRESS, VERY_LONG_PRESS, VERY_VERY_LONG_PRESS, EXTREMELY_LONG_PRESS, DOUBLE_PRESS and two more	Unconfirmed: the press lengths
Action button	svc28 field 29	SHORT_PRESS_DOWN, SHORT_PRESS_UP, LONG_PRESS_UP	Unconfirmed: whether this is the capture button

Other svc28 fields name events that the glasses have not been seen to send. They are tampering (field 12, with a lux reading and an indoor flag), water_detect (field 35), hot_car (field 18) and camera_sensing (field 36).

LEDs

svc28 field 8 carries the LED state: led_ok, privacy_led_ok, led_active and privacy_led_active. The meaning of the privacy LED flags is unknown.

Pairing mode

1. Fold both arms.
2. Hold the capture button for about 5 seconds.
3. The LED inside the frame blinks blue.

Sources differ on the hold time: 5 seconds in one, 12 seconds in a Ray-Ban FAQ. The minimum hold is unconfirmed.

Holding the case's back button for 5 seconds is another route into pairing. Its effect is unknown.

Hardware self-checks

svc28 field 7 carries the hardware state as six booleans: dsp_ok, imu_ok, mcu_ok, microphone_ok, speaker_ok and captouch_ok. No false value has been reported so far.

The flow below shows how the phone reads these states.

flowchart LR
    A["Phone sends svc28 type 1000<br/>subscribe to device state"] --> B["Glasses send svc28 type 2005<br/>full snapshot"]
    B --> C["Glasses send types 2006 to 2044<br/>one field each"]

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Reference code

Reference code: Status.kt, SettingSpec.kt, Constants.kt, GlassesLook.kt

Open questions

• Why the product codename in the build fingerprint is hammerhead on Ray-Ban Meta Gen 2, which the table gives to product 258.
• The meaning of PVT. It is inferred from the usual stage names.
• Which video setting produces the 1728x2304 frames.
• Why the live-photo clip runs at a variable rate, about 14 frames per second on average, when the video runs at 30.
• The minimum hold time for pairing mode.
• Which physical control sends the action button, field 29.
• Which touch gestures the glasses send for a real tap.
• The unit of the thermal temperature field, svc28 field 13 field 2.
• What the privacy LED flags mean during a recording.
• Whether tamper, water, hot-car and overhead events ever arrive from the glasses.
• Whether peak power throttling causes large transfers to pause at low battery.