Wall Adapter Compatible with Philips Sonicare 4100 3100 2100 1100 ( HX3681 HX3661 HX3641) Sonicare One, COSLUS C40 C30, Bitvae D2 R2, SURI S1, Aquasonic Icon, 7AM2M, Onlyone Electric Toothbrush (USB charging cable not included) Built-in safety features, including overcharge protection and short circuit protection, to ensure the safety of your devices Adapter Input: AC 100-240V 50/60Hz Dual USB Port, Can support charging of 2 electric toothbrushes at the same time Compact and lightweight design, easy storage and portability; Great for travel, home or bathroom use Power Adapter Compatible With: New Philips Sonicare 4100, 3100, 2100, 1100 ( HX3681, HX3661, HX3641), Bitvae, COSLUS, 7AM2M Power Toothbrush (USB charging cable not included) Dual USB Port, Can support charging of 2 electric toothbrushes at the same time Compact and lightweight design, easy storage and portability; Great for travel, home or bathroom use