I'm going to the US for a conference and want to buy my dad a Philips razor, what's the best Philips two-head razor model? Thank you!

2 head of the best is HQ9090, 3 head in line with the price you want is HQ7180, but in fact, in addition to more than one head, 7180 is not as good as 9090, 9090 charging time is 80 minutes, 7180 only 35 minutes, 9090 also has a SmartTouch surface system, more service to the face, is a smart series of speed; and cleaning tips, head Replacement tips are very humanized. If you buy abroad, the model is different from the domestic or no 2 cutter head, to give you the most stupid method, the number of large than the number of small good, because Philips new program is to add up, 9090 larger than 7180, relatively speaking, 9090 is new, better than the former function. But now the latest products start is RQ, such as RQ1095 selling price of 4000 or so, do not get it wrong. With the knife head judgment is relatively simple, the cheapest is HQ2, the most expensive is HQ10; HQ8 above the beard knife are great; charging time is best to one hour fast-charging; don't forget to buy a backup knife head by the way, if the price is cheaper must be prepared, because no matter where the country knife head are all the original Dutch imports, expensive is also expensive in it