The cutter heads No. 1, 2, 3, and 4 are the same, with 15 cutter heads and single-layer blades. Eliminating products does not reflect the advantages of Philips.

The No. 5 and No. 6 cutter heads are the same, with 15 cutter heads and double-layer blades. Low-end products, good quality and low price. The "beard lift" function is obvious, but it is only suitable for young people with soft beards.

The No. 7 and No. 8 cutter heads are the same, with 9 cutter heads and double-layer blades. Mid-range product, good value for money. The effect of trimming thick beards is obvious.

The No. 9 cutter head is a double ring, with 12 cutter heads on the outer ring and a double-layer blade, and an inner ring of 6 cutter heads and a single-layer blade. Shave quickly. Although it is a high-end product, the low-priced product 9080 in its double-head series is the most valuable in my opinion.

No. 10 cutter head, Philips’ top product.

Philips HQ912: The color is black; the cutter head type is rotary; the charging time is 8 hours; the charging indicator light is green.

Philips HQ916: The cutter head type is rotary; the operating time is 30 minutes; the external power supply is 100-240V; the charging time is 8 hours.

Philips HQ902: The color of the shaver is blue; the blade type is rotary; the compatible battery is 2 AA dry batteries.