An armband that promises to help you kick bad habits like eating too much fast food or biting your nails is being sold by Amazon for £193 ($242).

The Pavlok bracelet gives users a penalty of a 350-volt electric shock every time they step out of line.

It works for a wide range of nasty habits including smoking, sleeping in, spending too much time on the internet and even sleeping in.

Users have to administer the shocks themselves or the Pavlok app can be downloaded by friends so that they can give you a buzz if they catch you out.

Some habits - particularly those that are sleep related, such as not waking up at the right time - can be automated via the app.

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An arm band that promises to help you kick bad habits like eating too much fast food or biting your nails is being sold by Amazon for £193. The Pavlok bracelet gives users a penalty of a 350-volt electric shock every time they step out of line

HOW DOES THE BAND WORK? Pavlok has two parts: the wristband and the module. The wristband is 'one size fits all', and made from silicone. You can also choose from various different colours (The standard wristband comes in black). The module fits inside the wristband and holds the rechargeable battery, electronic components and Bluetooth. Pavlok's battery has the capacity for over 150+ tiny jolts and it recharges quickly (it comes with a micro USB). While the Bluetooth chip is low energy and connects Pavlok to your smart phone. Advertisement

Users need to wear their bands - created by Behavioral Technology in Salt Lake City, Utah - throughout the day and give themselves a zap when they engage in the habit they're trying to quit.

The company claims that 'within 3-5 days', you'll begin to notice your cravings significantly reduced if not gone entirely.

'Pavlok allows you to speak your reptile brain's language by adding an unpleasant element, or a safe and harmless 'zap' of electricity on your wrist.

This means that what you have been taught to love, it conditions your mind to associate an 'unpleasant' feeling with your bad habit, according to the manufacturer.

It is priced at £193 on Amazon's website.

It has 150 shocks per charge, so, depending how much of a rule breaker you are, it could last a while.

Inventor Maneesh Sethi says that while it isn't as powerful as a shock from a tazer, it still delivers enough voltage to shock you make you jump.

It works for a wide range of nasty habits including smoking, sleeping in, spending too much time on the internet and even sleeping in. To give more of an incentive, the Pavlok app can be downloaded by friends so that they can give you a buzz if they catch you eating fast food

Users need to wear their bands throughout the day and give themselves a zap when they engage in the habit they're trying to quit. The company says that 'within 3-5 days', you'll begin to notice your cravings significantly reduced if not gone entirely

He told ABC news: 'It feels like if you were to touch a doorknob after rubbing your socks on the carpet.'

He added: 'There's a real power in using a little bit of pain to help you break your bad habits.'

The idea was born out of Mr Sethi's social media addiction.

'I suffered from ADHD, and found myself addicted to Facebook. I wrote a blog post where I hired someone to slap me every time I went on Facebook, and my productivity skyrocketed,' he said.

'On the other hand, none of my many fitness trackers motivated me at all. So I thought, 'why are there so many devices tracking what I do, but not changing what I do?' And Pavlok was born.'

Although there are many testimonies on the internet from people who have successfully quit bad habits using the watch, not everyone is convinced.

Some experts say that the band's technology is 'not a science'.

Doctor Greg Cason, a psychologist said: 'Devices like this don't really work. Unless they are locked onto people's wrists, they're going to take them off.'

'Pavlok allows you to speak your reptile brain's language by adding an unpleasant element, or a safe and harmless 'zap' of electricity on your wrist. This means that what you have been taught to love, it conditions your mind to associate an 'unpleasant' feeling with your bad habit

Although there are many testimonies on the internet from people who have successfully quit bad habits using the watch, not everyone is convinced. Some experts say that the band's technology is 'not a science'

Reviews on Amazon's website have also been mixed.

One customer wrote: 'Wrist band is a little awkward but it does allow for the contacts to be positioned closely to your skin for the best results. I've only used the button on the device to administer the shock.

'I can't comment on how the hand motion function works. The app is ok and does give some information and videos on how to beat whatever habit you're trying to break.

'At 100 per cent on a decent charge it is more than enough of a zap to get your attention.

'I'm glad I bought it, so far I believe it is working. It's not going to cure a lifelong issue in a few days so you have to stick to their plan and really work on it.'