From the manufacturer

 
  Aquatouch S5420/06 Series 7000 S7370/12 Series 7000 S7530/50 Series 9000 S9041/12 Series 9000 S9031/26
Great for Reduced nicks and cuts Reduced skin irritation Reduced skin irritation Perfection in every pass Perfection in every pass
Key feature 10 x less nicks and cuts vs a regular blade* (*Test done in Germany 2015, after 21 days acclimation) Proven to reduce Skin Irritation, 70 per cent of men agree** (**Tested for 4 weeks by 100 blade users with sensitive skin, UK 2015) Proven to reduce Skin Irritation, 70 per cent of men agree** (**Tested for 4 weeks by 100 blade users with sensitive skin, UK 2015) Cuts up to 20 per cent more hair in a single pass**** (****vs. SensoTouch ranges) Cuts up to 20 per cent more hair in a single pass**** (****vs. SensoTouch ranges)
Number of directions the shaving head adapts 5 5 5 8 8
Aquatech technology for use in shower and with foam
What is also included in the package? SmartClick precision trimmer, protection cap SmartClick Precision trimmer, protection cap and travel pouch SmartClick Beard styler, SmartClick Facial brush, protection cap and travel pouch SmartClick precision trimmer, protection cap and travel pouch SmartClick Precision trimmer, protection cap, travel pouch, SmartClean system & cleaning cartridge
Usage/charging time 45 min / 1 hr Includes quick charge option 50 min / 1 hr Includes quick charge option 50 min / 1 hr Includes quick charge option 50 min / 1 hr Includes quick charge option 50 min / 1 hr Includes quick charge option
Cordless usage
Display LED - 3 bars LED - 3 bars LED - 3 bars Digital display LED - 3 bars
Maintenance Easy clean with water Easy clean with water Easy clean with water Easy clean with water SmartClean system with the cleaning cartridge
Replacement heads (every 2 years) SH50 SH70 SH70 SH90 SH90