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A Japanese electronics company has unveiled a $1million robot which weighs four tonnes, stands 13ft tall and can be controlled by iPhone.

Kuratas is fitted with a futuristic weapons system, including a gun capable of shooting 6,000 BB bullets a minute.

There is also a one-man cockpit if the pilot prefers to unleash his ammunition from a position inside the robot.

(Image: Getty)

Kuratas has around 30 hydraulic joints which the pilot moves using motion control, and according to the makers Suidobashi Heavy Industry, the weapons are fired when the operator smiles.

The machine was unveiled to the world at the Wonder Festival in the Tokyo suburb of Chiba.

Suidobashi even released a tongue-in-cheek video showing how to operate the robot, in which female pilot Anna warns against smiling too much whilst operating the Kuratas weaponry.

It has two humanoid arms and four wheeled legs, and twin six-barrelled gatling guns which fire BB-sized pellets at the rate of 6,000 rounds per minute.

But despite its fearsome appearance, the robot was allowed out onto the streets of Tokyo where it was seen being driven through the traffic powered by a diesel engine.

The device, which travels at just 7mph, can be set to move in a low or high position to enhance the pilot's field of view.

(Image: YouTube)

It also features a Lohas launcher - which fires bottles of water - and Iron Crow hands and "feet".

Anyone interested in buying the custom-made machine even has a choice of colours, including a rather misleading pink.

The robot can be piloted directly, or remotely by a user connected to a 3G device such as a laptop, tablet or smartphone.