> ## Documentation Index
> Fetch the complete documentation index at: https://docs.wuji.tech/llms.txt
> Use this file to discover all available pages before exploring further.

# User Notice

> [!NOTE]
>
> Before using Wuji Hand 2, read these safety notices and the 2.2 capability boundaries carefully to ensure safe operation and personal safety.

> [!WARNING]
>
> Improper operation can damage the device or cause injury. Follow the safety rules below strictly.

## Power Safety

**Power requirement**: 11–13 V DC (12 V nominal)

**External harness**: the wrist directly leads out two cables—**XT30 + RJ45 network port**

> [!WARNING]
>
> 2.2 supports an input of 11–13 V DC, with a nominal voltage of 12 V. Don't connect a voltage outside this range. The external interface form and the supply voltage range will change in later versions, so leave room in your integration design.

**Power adapter**:

* Use the official power adapter (12 V 20 A).
* If you replace it, use a supply with an output in the 11–13 V DC range. A nominal 12 V supply rated for at least 200 W is recommended.

![Standard 12 V 20 A power adapter and its AC cable](https://mintcdn.com/wuji-0bbde051/5Gi8SRDtLtPD19Vi/shared/assets/source/images/en/wuji-hand/latest/user-notice/power-adapter.png?fit=max\&auto=format\&n=5Gi8SRDtLtPD19Vi\&q=85\&s=edbb254653f43026979c10c911ea8c28)

**Wiring rules**:

* Before wiring, check the XT30 power connector for looseness, oxidation, or damage.
* Confirm polarity before wiring. Never reverse-connect.
* Never plug or unplug power or communication cables while Wuji Hand 2 is running.

![XT30 extension cable with connector checks and polarity markings](https://mintcdn.com/wuji-0bbde051/5Gi8SRDtLtPD19Vi/shared/assets/source/images/en/wuji-hand/latest/user-notice/power-wiring.png?fit=max\&auto=format\&n=5Gi8SRDtLtPD19Vi\&q=85\&s=5901d15250e07afd2d4408b04d1e2bf2)

**Power-down and storage**:

* Power off the device when it isn't in use.
* Before disconnecting power, stop motion and confirm the hand is at rest.

**During firmware upgrade**:

* Don't disconnect power or unplug cables during an upgrade. Wait until the upgrade finishes before doing anything else.

![XT30 power cable and RJ45 cable stay connected while Wuji Hand 2 runs or upgrades](https://mintcdn.com/wuji-0bbde051/5Gi8SRDtLtPD19Vi/shared/assets/source/images/en/wuji-hand/latest/user-notice/hot-plug.png?fit=max\&auto=format\&n=5Gi8SRDtLtPD19Vi\&q=85\&s=73e58177848e39b2df5e710bd1807c75)

## Mechanical Operation Safety

* **Pinch and injury prevention**: Never reach toward or bring your body near Wuji Hand 2 while it moves. Take care to avoid pinch injuries.
* **Drop prevention**: Prevent drops during handling, placement, or operation. A drop can damage structural parts, joints, and internal components.
* **Parameter safety**: Before changing default motion parameters, make sure it's safe, to avoid accidental injury.
* **Valuables**: Don't grasp fragile or high-value objects, to avoid losses.
* **Collaborative use**: Prevent collisions when working with robot arms or other equipment.
* **Workspace safety**: Keep the workspace clear of fragile, flammable, or other hazardous items.

![Six mechanical safety reminders: pinch prevention, drop prevention, parameter safety, valuables, collaborative use, and workspace safety](https://mintcdn.com/wuji-0bbde051/5Gi8SRDtLtPD19Vi/shared/assets/source/images/en/wuji-hand/latest/user-notice/mechanical-safety.png?fit=max\&auto=format\&n=5Gi8SRDtLtPD19Vi\&q=85\&s=bb8f145654f593350c7c9bdd195d19ef)

## Environmental Requirements

* **Operating temperature**: Use at room temperature (15–30 ℃).
* **Over-temperature protection**: Wuji Hand 2 has thermal protection.
* **Water and dust**: Use the hand only in a dry, clean environment. Keep out liquids, oil mist, and dust.
* **Ventilation**: Leave enough space around Wuji Hand 2 for heat dissipation.
* **Magnetic protection**: Keep the joint areas away from metal or magnetic objects to avoid encoder interference or magnet damage.

![Five environment conditions: operating temperature 15–30 ℃, over-temperature protection, water and dust, ventilation, and magnetic protection](https://mintcdn.com/wuji-0bbde051/5Gi8SRDtLtPD19Vi/shared/assets/source/images/en/wuji-hand/latest/user-notice/environment.png?fit=max\&auto=format\&n=5Gi8SRDtLtPD19Vi\&q=85\&s=e672ec88fdc8335c199f49aefcb84710)

> [!WARNING]
>
> The housing heats up at high temperatures. Don't touch it, to avoid burns.

## Cable and Flex-Cable Protection

* **Flex-cable protection**: The flex cables on the finger surface are fragile. Keep the soft pad and skin fitted at all times to avoid scratching, squeezing, or impact.
* **Cable routing**: Avoid pulling and sharp bends. Leave slack and keep cables away from sharp edges, heat sources, and moving parts.
* **Connector protection**: Pull data cables along their axis. Don't lift or pull them sideways, to avoid connector damage.

![Three cable care points: flex-cable protection, cable routing, and connector protection](https://mintcdn.com/wuji-0bbde051/5Gi8SRDtLtPD19Vi/shared/assets/source/images/en/wuji-hand/latest/user-notice/cable-protection.png?fit=max\&auto=format\&n=5Gi8SRDtLtPD19Vi\&q=85\&s=42d49509451b19b638dc62e6192302df)

## Capability Boundaries and Items Not Yet Provided

> [!WARNING]
>
> This part lists the capability boundaries and the items not yet provided for the 2.2 prototype. Confirm each one before use.

| Item | 2.2 status |
| - | - |
| Simulation model with soft pad | The simulation model includes fingertip soft pads (separate links that take part in contact). A whole-hand soft-pad model isn't provided |

## Soft Pad and Skin

* Always run the hand with the skin fitted. Never run it without the skin, which you can remove and replace yourself.
* Fingertip soft-pad hardness is still being tuned, and the skin design isn't finalized.
* Soft-pad contact properties, surface friction, appearance, and feel will keep evolving.
* Don't take the current prototype's feel, appearance, and soft-pad life as a reference for the final product.

## Thermal

* The thermal design is still iterating.
* Temperature rise, surface temperature, and throttling behavior under long continuous operation aren't verified yet.
* Don't run long full-load or high-load continuous tests on the 2.2 prototype.

## Reliability and Durability

* Whole-unit reliability testing is ongoing.
* 2.2 makes no guarantee on durability, life, drop, vibration, or shock.
* Contact your point of contact immediately if a prototype is damaged.

## Motor Load Capacity

* Whole-hand motor peak force, rated force, and load curves may change later.
* The prototype's measured load values aren't committed external values, and they aren't a basis for design or purchasing decisions.

## Joint Zero Calibration

* Joint zero-calibration accuracy is still being optimized. The prototype may show larger-than-expected zero errors.
* Don't take the prototype's zero accuracy as a reference for the final product.

## Joint Back-Drive and Torque Transparency

* Back-drive torque consistency across joints is still being tuned.
* Estimating external joint torque from joint current: the forward path exists in 2.2, but the hardware consistency and calibration accuracy it relies on haven't converged, and closed-loop performance isn't verified.
* In 2.2, don't use joint current readings to judge external contact force or torque. Don't take these values as a reference for the final product.


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