I bought this about 6 months ago. Its a bit of a fiddle, but if you take the time to fit it properly and cover the mic but not the screen. I did a back to back test with my car. forward facing wind noise masked the engine note from 30mph. With the cover fitted it was 45-50mph before it was deafening wind noise. so for £2 I'm happy.
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50800mAh Car Jump Starter Pack Portable Booster Charger Battery Power Bank 12V
08 May, 2018
Amazing life saver
I bought this as my old style jump pack broke. I wasnt expecting a lot, at least it would be a good mobile phone charger for camping trips. But this can almost turn over a 1.6L petrol engine with out the car battery connected. It will happily boost low batteries on a 2.5L petrol and 1.9L TDi and ti fits in your pocket!