Avoid congestion charge fines
Once buyers have registered their details, the device can be plugged into the lighter socket of a car and will then automatically pay the Congestion Charge when the car enters the charging zone.
The device is called the KenBuster - a name that will remain unchanged despite Boris Johnson ousting Ken Livingstone, who created the charge, in last week's London mayoral elections.
At present, around 100,000 people a month are fined for failing to pay the Congestion Charge.
Failure to pay results in a fine of £120, reduced to £60 if paid within 14 days, but increasing to £180 if unpaid after 28 days. Fines generate nearly £100 million a year for Transport for London.
The KenBuster costs £199.99 for lifetime use, or can be hired for £8 a month plus a one-off £49.99 payment.
Featured in this story