After being launched in a blaze of glory three years ago, Google Glass was pulled in January following poor sales and mixed reviews.

But instead of abandoning the project, Google said at the time it planned to redesign the headset 'from scratch' - and a new filing suggests it is making good on this promise.

Filed by Google last month, the papers reveal the tech giant has successfully tested a mystery device, and rumours suggest its 'GG1' label stands for Google Glass.

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Papers filed by Google last month reveal the tech giant has successfully tested a mystery device, and rumours suggest its 'GG1' model name stands for Google Glass (original version pictured). The files don't reveal what type of instrument it is, but it will run Bluetooth and Wi-Fi

The test report was submitted to the Federal Communications Committee (FCC) at the start of June and was made available on 1 July. It was first spotted by fan site DroidLife.

Electronic devices need to receive the FCC Declaration of Conformity, or FCC label, before they can be sold and manufactured in the US.

This label certifies that any electromagnetic interference emitted by the tested device is safe for use.

Google's mystery device is simply described as an instrument in the filing.

It doesn't reveal what type of instrument it is - whether it's a phone, tablet, wearable of other electronic product - and illustrations give little away.

THE RISE OF THE GLASSHOLE The previous Google Glass headset was launched in a beta version under the firm's Explorer programme. This programme gave software developers the chance to buy Glass for $1,500 (£990), and was launched in the US in 2013, and the UK last summer. But, as the Explorers hit the streets, they drew stares and jokes. Some people viewed the device, capable of surreptitious video recording, as an obnoxious privacy intrusion, deriding the once-proud Explorers as 'Glassholes.' 'It looks super nerdy,' said Shevetank Shah, a Washington, DC-based consultant, whose Google Glass now gathers dust in a drawer. 'I'm a card carrying nerd, but this was one card too many.' Advertisement

However, there are some details that can be gleaned from the files.

For example, its model number is listed as GG1, which may be short for 'Google Glass 1.'

It is described cryptically as 'Bluetooth & DTS/UNII a/b/g/n/ac', suggesting it is Bluetooth and Wi-Fi enabled.

In particular, the files show the device can support the 802.11a/b/g/n/ac Wi-Fi designations on 2.4GHz and 5GHz as well as low energy Bluetooth.

The test setup shows it connected to a PC using a USB cable capable of charging and transferring data.

It has rechargeable, non-removable batteries and comes with an AC charger.

The model number is the biggest hint at the device being the next-generation headset, although tablets and phones also come with these features so it could be a different device entirely.

However, it does follow months of rumours and speculation that was fuelled when Glass boss Tony Fadell said in February he wanted to redesign the headset from 'scratch' and won't release it until 'it's perfect'.

The previous Google Glass headset was launched in a beta version under the firm's Explorer programme.

Electronic devices need to receive the FCC Declaration of Conformity before they can be sold and manufactured in the US. Google's device is described as 'Bluetooth & DTS/UNII a/b/g/n/ac', suggesting it is Bluetooth and Wi-Fi enabled. The test setup shows it connected to a PC using a USB cable (illustrated)

The model number is the biggest hint the device is the next-generation headset, although tablets and phones also come with these features so it could be a different device entirely. It does follow months of speculation that was fuelled when Glass boss Tony Fadell said he wanted to redesign the headset (pictured) from 'scratch'

This programme gave software developers the chance to buy Glass for $1,500 (£990), and was launched in the US in 2013, and the UK in last summer.

The firm had already been thought to be developing a new version, with chips made by Intel, to go on sale later this year.

Aside from saying it was committed to working on the future of the product, Google gave no timescale for the launch of an improved product.

'It's hard to believe Glass started as little more than a scuba mask attached to a laptop,' the Glass team said in a post on Google+ last month.

'We kept on it, and when it started to come together, we began the Glass Explorer Program as a kind of 'open beta' to hear what people had to say.'

'Glass was in its infancy, and you took those very first steps and taught us how to walk.