Last week purchased Philips QT4019 Trimmer , inside the box, they had given information regarding warranty and registration.For products registered on their website extra one year warranty will be given,for this we need Serial Number of the product.
i have searched every corner of the box and rear side of the trimmer , i could not able to find it, then i called to customer care they guided me well.
FINDING serial nuber....
take the trimmer and detach the detachable part of head, and check at back side of trimmer ,you will find 4 digit number, enter the four digits and register your product and get extra one year warranty.......
Hope this post is useful....