A:Answer Hello! Whichever adapter you choose to charge the Philips Norelco Shaver S3145/90, ensure that it meets the requirements below (this information will usually be printed on the adapter itself). Input voltage: 100-240V ~ 50/60Hz. Output voltage: 5V. Power output: 1A or higher. Water tightness: IPX4* for moist environments. Approval mark: relevant approval/certification mark for your country (e.g. CE, UL, UKCA, INMETRO, IRAM, etc.)